40638972 has 24 divisors (see below), whose sum is σ = 103444992. Its totient is φ = 12314800.

The previous prime is 40638971. The next prime is 40638977. The reversal of 40638972 is 27983604.

It is a self number, because there is not a number n which added to its sum of digits gives 40638972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153804 + ... + 154067.

It is an arithmetic number, because the mean of its divisors is an integer number (4310208).

Almost surely, 2^40638972 is an apocalyptic number.

It is an amenable number.

40638972 is an abundant number, since it is smaller than the sum of its proper divisors (62806020).

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

40638972 is a wasteful number, since it uses less digits than its factorization.

40638972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307889 (or 307887 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 40638972 is about 6374.8703516228. The cubic root of 40638972 is about 343.8066224302.

The spelling of 40638972 in words is "forty million, six hundred thirty-eight thousand, nine hundred seventy-two".