399997156 has 12 divisors (see below), whose sum is σ = 753840892. Its totient is φ = 184614048.

The previous prime is 399997153. The next prime is 399997187. The reversal of 399997156 is 651799993.

It can be written as a sum of positive squares in 2 ways, for example, as 235131556 + 164865600 = 15334^2 + 12840^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 399997156.

It is not an unprimeable number, because it can be changed into a prime (399997151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3846075 + ... + 3846178.

Almost surely, 2^399997156 is an apocalyptic number.

It is an amenable number.

399997156 is a deficient number, since it is larger than the sum of its proper divisors (353843736).

399997156 is a wasteful number, since it uses less digits than its factorization.

399997156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692270 (or 7692268 counting only the distinct ones).

The product of its digits is 4133430, while the sum is 58.

The square root of 399997156 is about 19999.9288998736. The cubic root of 399997156 is about 736.8045534930.

The spelling of 399997156 in words is "three hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred fifty-six".