398745 has 12 divisors (see below), whose sum is σ = 691236. Its totient is φ = 212640.

The previous prime is 398731. The next prime is 398759. The reversal of 398745 is 547893.

It is an interprime number because it is at equal distance from previous prime (398731) and next prime (398759).

It can be written as a sum of positive squares in 2 ways, for example, as 301401 + 97344 = 549^2 + 312^2 .

It is not a de Polignac number, because 398745 - 2⁴ = 398729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4386 + ... + 4475.

It is an arithmetic number, because the mean of its divisors is an integer number (57603).

2³⁹⁸⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

398745 is a deficient number, since it is larger than the sum of its proper divisors (292491).

398745 is a wasteful number, since it uses less digits than its factorization.

398745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872 (or 8869 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 398745 is about 631.4625879654. The cubic root of 398745 is about 73.6034915837.

The spelling of 398745 in words is "three hundred ninety-eight thousand, seven hundred forty-five".