| Base | Representation |
|---|---|
| bin | 1001100100010… |
| … | …1000011011100 |
| 3 | 2210111202021100 |
| 4 | 2121011003130 |
| 5 | 40233104412 |
| 6 | 3552033100 |
| 7 | 665042250 |
| oct | 231050334 |
| 9 | 83452240 |
| 10 | 40128732 |
| 11 | 20719346 |
| 12 | 11532790 |
| 13 | 8410317 |
| 14 | 5488260 |
| 15 | 37c9edc |
| hex | 26450dc |
40128732 has 72 divisors (see below), whose sum is σ = 117936000. Its totient is φ = 11266848.
The previous prime is 40128731. The next prime is 40128733. The reversal of 40128732 is 23782104.
It is an interprime number because it is at equal distance from previous prime (40128731) and next prime (40128733).
It is a super-2 number, since 2×401287322 = 3220630263855648, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 40128696 and 40128705.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (40128731) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13519 + ... + 16217.
It is an arithmetic number, because the mean of its divisors is an integer number (1638000).
Almost surely, 240128732 is an apocalyptic number.
40128732 is a gapful number since it is divisible by the number (42) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 40128732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58968000).
40128732 is an abundant number, since it is smaller than the sum of its proper divisors (77807268).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
40128732 is a wasteful number, since it uses less digits than its factorization.
40128732 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2775 (or 2770 counting only the distinct ones).
The product of its (nonzero) digits is 2688, while the sum is 27.
The square root of 40128732 is about 6334.7243033932. The cubic root of 40128732 is about 342.3616774991.
The spelling of 40128732 in words is "forty million, one hundred twenty-eight thousand, seven hundred thirty-two".
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