40072638 has 32 divisors (see below), whose sum is σ = 85536000. Its totient is φ = 12471680.

The previous prime is 40072631. The next prime is 40072639. The reversal of 40072638 is 83627004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40072631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11863 + ... + 14861.

It is an arithmetic number, because the mean of its divisors is an integer number (2673000).

Almost surely, 2^40072638 is an apocalyptic number.

40072638 is an abundant number, since it is smaller than the sum of its proper divisors (45463362).

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

40072638 is a wasteful number, since it uses less digits than its factorization.

40072638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 40072638 is about 6330.2952537777. The cubic root of 40072638 is about 342.2020795398.

The spelling of 40072638 in words is "forty million, seventy-two thousand, six hundred thirty-eight".