40138836 has 48 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 12282880.

The previous prime is 40138817. The next prime is 40138837. The reversal of 40138836 is 63883104.

It is a super-2 number, since 2×40138836² = 3222252310869792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40138797 and 40138806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40138837) 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, 5965 + ... + 10763.

It is an arithmetic number, because the mean of its divisors is an integer number (2116800).

Almost surely, 2^40138836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40138836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50803200).

40138836 is an abundant number, since it is smaller than the sum of its proper divisors (61467564).

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

40138836 is a wasteful number, since it uses less digits than its factorization.

40138836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864 (or 4862 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 40138836 is about 6335.5217622545. The cubic root of 40138836 is about 342.3904094651.

The spelling of 40138836 in words is "forty million, one hundred thirty-eight thousand, eight hundred thirty-six".