40040008 has 8 divisors (see below), whose sum is σ = 75075030. Its totient is φ = 20020000.

The previous prime is 40039999. The next prime is 40040017. The reversal of 40040008 is 80004004.

It is an interprime number because it is at equal distance from previous prime (40039999) and next prime (40040017).

It can be written as a sum of positive squares in only one way, i.e., 38962564 + 1077444 = 6242^2 + 1038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 40039973 and 40040000.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2502493 + ... + 2502508.

Almost surely, 2^40040008 is an apocalyptic number.

It is an amenable number.

40040008 is a deficient number, since it is larger than the sum of its proper divisors (35035022).

40040008 is a wasteful number, since it uses less digits than its factorization.

40040008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005007 (or 5005003 counting only the distinct ones).

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

The square root of 40040008 is about 6327.7174399621. The cubic root of 40040008 is about 342.1091725379.

The spelling of 40040008 in words is "forty million, forty thousand, eight".