400605712 has 30 divisors (see below), whose sum is σ = 840477642. Its totient is φ = 184893696.

The previous prime is 400605703. The next prime is 400605767. The reversal of 400605712 is 217506004.

It can be written as a sum of positive squares in 3 ways, for example, as 1245456 + 399360256 = 1116^2 + 19984^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71373 + ... + 76780.

Almost surely, 2^400605712 is an apocalyptic number.

It is an amenable number.

400605712 is an abundant number, since it is smaller than the sum of its proper divisors (439871930).

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

400605712 is a wasteful number, since it uses less digits than its factorization.

400605712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148187 (or 148168 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 400605712 is about 20015.1370717265. The cubic root of 400605712 is about 737.1780225082.

The spelling of 400605712 in words is "four hundred million, six hundred five thousand, seven hundred twelve".