40004015 has 16 divisors (see below), whose sum is σ = 50416128. Its totient is φ = 30413856.

The previous prime is 40004011. The next prime is 40004017. The reversal of 40004015 is 51040004.

It is a cyclic number.

It is not a de Polignac number, because 40004015 - 2² = 40004011 is a prime.

It is a super-2 number, since 2×40004015² = 3200642432240450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40004011) 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, 18164 + ... + 20246.

It is an arithmetic number, because the mean of its divisors is an integer number (3151008).

Almost surely, 2^40004015 is an apocalyptic number.

40004015 is a deficient number, since it is larger than the sum of its proper divisors (10412113).

40004015 is a wasteful number, since it uses less digits than its factorization.

40004015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40004015 is about 6324.8727259922. The cubic root of 40004015 is about 342.0066315416.

Adding to 40004015 its reverse (51040004), we get a palindrome (91044019).

The spelling of 40004015 in words is "forty million, four thousand, fifteen".