398656 has 14 divisors (see below), whose sum is σ = 791210. Its totient is φ = 199296.

The previous prime is 398627. The next prime is 398669. The reversal of 398656 is 656893.

It can be written as a sum of positive squares in only one way, i.e., 341056 + 57600 = 584^2 + 240^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3051 + ... + 3178.

It is an arithmetic number, because the mean of its divisors is an integer number (56515).

2³⁹⁸⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

398656 is a deficient number, since it is larger than the sum of its proper divisors (392554).

398656 is an equidigital number, since it uses as much as digits as its factorization.

398656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6241 (or 6231 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 398656 is about 631.3921127160. The cubic root of 398656 is about 73.5980150693.

The spelling of 398656 in words is "three hundred ninety-eight thousand, six hundred fifty-six".