40212040 has 64 divisors (see below), whose sum is σ = 100440000. Its totient is φ = 14365440.

The previous prime is 40212031. The next prime is 40212041. The reversal of 40212040 is 4021204.

It is a self number, because there is not a number n which added to its sum of digits gives 40212040.

It is not an unprimeable number, because it can be changed into a prime (40212041) 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 15 ways as a sum of consecutive naturals, for example, 25186 + ... + 26734.

It is an arithmetic number, because the mean of its divisors is an integer number (1569375).

Almost surely, 2^40212040 is an apocalyptic number.

40212040 is a gapful number since it is divisible by the number (40) 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 40212040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50220000).

40212040 is an abundant number, since it is smaller than the sum of its proper divisors (60227960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40212040 is a wasteful number, since it uses less digits than its factorization.

40212040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 40212040 is about 6341.2963974254. The cubic root of 40212040 is about 342.5984301607.

Adding to 40212040 its reverse (4021204), we get a palindrome (44233244).

The spelling of 40212040 in words is "forty million, two hundred twelve thousand, forty".