398256369 has 24 divisors (see below), whose sum is σ = 620524800. Its totient is φ = 226535904.

The previous prime is 398256367. The next prime is 398256389. The reversal of 398256369 is 963652893.

It is not a de Polignac number, because 398256369 - 2¹ = 398256367 is a prime.

It is a super-2 number, since 2×398256369² = 317216270898128322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (398256367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26707 + ... + 38855.

It is an arithmetic number, because the mean of its divisors is an integer number (25855200).

Almost surely, 2^398256369 is an apocalyptic number.

It is an amenable number.

398256369 is a deficient number, since it is larger than the sum of its proper divisors (222268431).

398256369 is a wasteful number, since it uses less digits than its factorization.

398256369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389 (or 12382 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 51.

The square root of 398256369 is about 19956.3616172889. The cubic root of 398256369 is about 735.7341417548.

The spelling of 398256369 in words is "three hundred ninety-eight million, two hundred fifty-six thousand, three hundred sixty-nine".