398641156 has 27 divisors (see below), whose sum is σ = 712974549. Its totient is φ = 195027888.

The previous prime is 398641151. The next prime is 398641157. The reversal of 398641156 is 651146893.

The square root of 398641156 is 19966.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46703556 + 351937600 = 6834^2 + 18760^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398641151) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 2675370 + ... + 2675518.

Almost surely, 2^398641156 is an apocalyptic number.

398641156 is the 19966-th square number.

It is an amenable number.

398641156 is a deficient number, since it is larger than the sum of its proper divisors (314333393).

398641156 is an equidigital number, since it uses as much as digits as its factorization.

398641156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 218 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The cubic root of 398641156 is about 735.9710158128.

The spelling of 398641156 in words is "three hundred ninety-eight million, six hundred forty-one thousand, one hundred fifty-six".