431389 has 4 divisors (see below), whose sum is σ = 493024. Its totient is φ = 369756.

The previous prime is 431381. The next prime is 431399. The reversal of 431389 is 983134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431389 - 2³ = 431381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30807 + ... + 30820.

It is an arithmetic number, because the mean of its divisors is an integer number (123256).

2⁴³¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

431389 is a deficient number, since it is larger than the sum of its proper divisors (61635).

431389 is an equidigital number, since it uses as much as digits as its factorization.

431389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61634.

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

The square root of 431389 is about 656.8021010929. The cubic root of 431389 is about 75.5596067448.

It can be divided in two parts, 431 and 389, that added together give a triangular number (820 = T₄₀).

The spelling of 431389 in words is "four hundred thirty-one thousand, three hundred eighty-nine".