40015904 has 12 divisors (see below), whose sum is σ = 78781374. Its totient is φ = 20007936.

The previous prime is 40015903. The next prime is 40015961. The reversal of 40015904 is 40951004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 17472400 = 4748^2 + 4180^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40015904.

It is not an unprimeable number, because it can be changed into a prime (40015903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625217 + ... + 625280.

Almost surely, 2^40015904 is an apocalyptic number.

It is an amenable number.

40015904 is a deficient number, since it is larger than the sum of its proper divisors (38765470).

40015904 is a wasteful number, since it uses less digits than its factorization.

40015904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250507 (or 1250499 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 40015904 is about 6325.8125169815. The cubic root of 40015904 is about 342.0405090919.

Adding to 40015904 its reverse (40951004), we get a palindrome (80966908).

The spelling of 40015904 in words is "forty million, fifteen thousand, nine hundred four".