40008138 has 16 divisors (see below), whose sum is σ = 80238720. Its totient is φ = 13298976.

The previous prime is 40008121. The next prime is 40008149. The reversal of 40008138 is 83180004.

40008138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40008138² = 3201302212454088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6883 + ... + 11286.

It is an arithmetic number, because the mean of its divisors is an integer number (5014920).

Almost surely, 2^40008138 is an apocalyptic number.

40008138 is an abundant number, since it is smaller than the sum of its proper divisors (40230582).

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

40008138 is a wasteful number, since it uses less digits than its factorization.

40008138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18541.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 40008138 is about 6325.1986530069. The cubic root of 40008138 is about 342.0183807364.

The spelling of 40008138 in words is "forty million, eight thousand, one hundred thirty-eight".