398957 has 4 divisors (see below), whose sum is σ = 429660. Its totient is φ = 368256.

The previous prime is 398941. The next prime is 398969. The reversal of 398957 is 759893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259081 + 139876 = 509^2 + 374^2 .

It is a cyclic number.

It is not a de Polignac number, because 398957 - 2⁴ = 398941 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 398957.

It is not an unprimeable number, because it can be changed into a prime (398917) 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, 15332 + ... + 15357.

It is an arithmetic number, because the mean of its divisors is an integer number (107415).

2³⁹⁸⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

398957 is a deficient number, since it is larger than the sum of its proper divisors (30703).

398957 is a wasteful number, since it uses less digits than its factorization.

398957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30702.

The product of its digits is 68040, while the sum is 41.

The square root of 398957 is about 631.6304299193. The cubic root of 398957 is about 73.6165334824.

The spelling of 398957 in words is "three hundred ninety-eight thousand, nine hundred fifty-seven".