40515988 has 6 divisors (see below), whose sum is σ = 70902986. Its totient is φ = 20257992.

The previous prime is 40515971. The next prime is 40515989. The reversal of 40515988 is 88951504.

It can be written as a sum of positive squares in only one way, i.e., 40170244 + 345744 = 6338^2 + 588^2 .

It is a super-2 number, since 2×40515988² = 3283090567232288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40515988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40515989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5064495 + ... + 5064502.

Almost surely, 2^40515988 is an apocalyptic number.

It is an amenable number.

40515988 is a deficient number, since it is larger than the sum of its proper divisors (30386998).

40515988 is a wasteful number, since it uses less digits than its factorization.

40515988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129001 (or 10128999 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 40515988 is about 6365.2170426467. The cubic root of 40515988 is about 343.4594561822.

The spelling of 40515988 in words is "forty million, five hundred fifteen thousand, nine hundred eighty-eight".