398631 has 8 divisors (see below), whose sum is σ = 537840. Its totient is φ = 262592.

The previous prime is 398627. The next prime is 398669. The reversal of 398631 is 136893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398631 - 2² = 398627 is a prime.

It is a super-2 number, since 2×398631² = 317813348322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480 + ... + 1013.

It is an arithmetic number, because the mean of its divisors is an integer number (67230).

2³⁹⁸⁶³¹ is an apocalyptic number.

398631 is a deficient number, since it is larger than the sum of its proper divisors (139209).

398631 is a wasteful number, since it uses less digits than its factorization.

398631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its digits is 3888, while the sum is 30.

The square root of 398631 is about 631.3723148824. The cubic root of 398631 is about 73.5964765760.

The spelling of 398631 in words is "three hundred ninety-eight thousand, six hundred thirty-one".