40008040 has 32 divisors (see below), whose sum is σ = 93934080. Its totient is φ = 15307072.

The previous prime is 40008029. The next prime is 40008071. The reversal of 40008040 is 4080004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20824 + ... + 22663.

It is an arithmetic number, because the mean of its divisors is an integer number (2935440).

Almost surely, 2^40008040 is an apocalyptic number.

40008040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40008040 is an abundant number, since it is smaller than the sum of its proper divisors (53926040).

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

40008040 is a wasteful number, since it uses less digits than its factorization.

40008040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43521 (or 43517 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 40008040 is about 6325.1909062099. The cubic root of 40008040 is about 342.0181014780.

Adding to 40008040 its reverse (4080004), we get a palindrome (44088044).

Subtracting from 40008040 its reverse (4080004), we obtain a square (35928036 = 5994²).

The spelling of 40008040 in words is "forty million, eight thousand, forty".