400071908 has 12 divisors (see below), whose sum is σ = 707058492. Its totient is φ = 198055200.

The previous prime is 400071857. The next prime is 400071911. The reversal of 400071908 is 809170004.

It can be written as a sum of positive squares in 2 ways, for example, as 355020964 + 45050944 = 18842^2 + 6712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494735 + ... + 495542.

It is an arithmetic number, because the mean of its divisors is an integer number (58921541).

Almost surely, 2^400071908 is an apocalyptic number.

It is an amenable number.

400071908 is a deficient number, since it is larger than the sum of its proper divisors (306986584).

400071908 is a wasteful number, since it uses less digits than its factorization.

400071908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990382 (or 990380 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 400071908 is about 20001.7976192141. The cubic root of 400071908 is about 736.8504489721.

The spelling of 400071908 in words is "four hundred million, seventy-one thousand, nine hundred eight".