398431 has 8 divisors (see below), whose sum is σ = 450000. Its totient is φ = 349440.

The previous prime is 398423. The next prime is 398441. The reversal of 398431 is 134893.

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 398431 - 2³ = 398423 is a prime.

It is a super-2 number, since 2×398431² = 317494523522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398441) 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, 306 + ... + 943.

It is an arithmetic number, because the mean of its divisors is an integer number (56250).

2³⁹⁸⁴³¹ is an apocalyptic number.

398431 is a deficient number, since it is larger than the sum of its proper divisors (51569).

398431 is a wasteful number, since it uses less digits than its factorization.

398431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289.

The product of its digits is 2592, while the sum is 28.

The square root of 398431 is about 631.2139098594. The cubic root of 398431 is about 73.5841663127.

The spelling of 398431 in words is "three hundred ninety-eight thousand, four hundred thirty-one".