40042664 has 16 divisors (see below), whose sum is σ = 75148020. Its totient is φ = 20003200.

The previous prime is 40042661. The next prime is 40042679. The reversal of 40042664 is 46624004.

It can be written as a sum of positive squares in 2 ways, for example, as 33062500 + 6980164 = 5750^2 + 2642^2 .

It is not an unprimeable number, because it can be changed into a prime (40042661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13892 + ... + 16524.

Almost surely, 2^40042664 is an apocalyptic number.

It is an amenable number.

40042664 is a deficient number, since it is larger than the sum of its proper divisors (35105356).

40042664 is a wasteful number, since it uses less digits than its factorization.

40042664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4540 (or 4536 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 40042664 is about 6327.9273067885. The cubic root of 40042664 is about 342.1167368210.

Adding to 40042664 its reverse (46624004), we get a palindrome (86666668).

The spelling of 40042664 in words is "forty million, forty-two thousand, six hundred sixty-four".