40000008 has 32 divisors (see below), whose sum is σ = 102130560. Its totient is φ = 13049280.

The previous prime is 40000003. The next prime is 40000021. The reversal of 40000008 is 80000004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 39999948 and 40000002.

It is not an unprimeable number, because it can be changed into a prime (40000003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16603 + ... + 18858.

It is an arithmetic number, because the mean of its divisors is an integer number (3191580).

Almost surely, 2^40000008 is an apocalyptic number.

It is an amenable number.

40000008 is an abundant number, since it is smaller than the sum of its proper divisors (62130552).

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

40000008 is a wasteful number, since it uses less digits than its factorization.

40000008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35517 (or 35513 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 40000008 is about 6324.5559527923. Note that the first 3 decimals coincide. The cubic root of 40000008 is about 341.9952121350.

The spelling of 40000008 in words is "forty million, eight", and thus it is an aban number and an uban number.