398981 has 16 divisors (see below), whose sum is σ = 483840. Its totient is φ = 324720.

The previous prime is 398977. The next prime is 398989. The reversal of 398981 is 189893.

It is not a de Polignac number, because 398981 - 2² = 398977 is a prime.

It is a super-2 number, since 2×398981² = 318371676722, which contains 22 as substring.

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 398981.

It is not an unprimeable number, because it can be changed into a prime (398989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4766 + ... + 4848.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2³⁹⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

398981 is a deficient number, since it is larger than the sum of its proper divisors (84859).

398981 is a wasteful number, since it uses less digits than its factorization.

398981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its digits is 15552, while the sum is 38.

The square root of 398981 is about 631.6494280849. The cubic root of 398981 is about 73.6180096326.

The spelling of 398981 in words is "three hundred ninety-eight thousand, nine hundred eighty-one".