397975156 has 6 divisors (see below), whose sum is σ = 696456530. Its totient is φ = 198987576.

The previous prime is 397975139. The next prime is 397975169. The reversal of 397975156 is 651579793.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 318051556 + 79923600 = 17834^2 + 8940^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49746891 + ... + 49746898.

Almost surely, 2^397975156 is an apocalyptic number.

It is an amenable number.

397975156 is a deficient number, since it is larger than the sum of its proper divisors (298481374).

397975156 is a wasteful number, since it uses less digits than its factorization.

397975156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99493793 (or 99493791 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 52.

The square root of 397975156 is about 19949.3146749456. The cubic root of 397975156 is about 735.5609311146.

The spelling of 397975156 in words is "three hundred ninety-seven million, nine hundred seventy-five thousand, one hundred fifty-six".