389431 has 4 divisors (see below), whose sum is σ = 445072. Its totient is φ = 333792.

The previous prime is 389401. The next prime is 389437. The reversal of 389431 is 134983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134983 = 347 ⋅389.

It is a cyclic number.

It is not a de Polignac number, because 389431 - 2⁵ = 389399 is a prime.

It is a super-2 number, since 2×389431² = 303313007522, 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 389431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389437) 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, 27810 + ... + 27823.

It is an arithmetic number, because the mean of its divisors is an integer number (111268).

2³⁸⁹⁴³¹ is an apocalyptic number.

389431 is a deficient number, since it is larger than the sum of its proper divisors (55641).

389431 is an equidigital number, since it uses as much as digits as its factorization.

389431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55640.

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

The square root of 389431 is about 624.0440689567. The cubic root of 389431 is about 73.0258868596.

Subtracting from 389431 its sum of digits (28), we obtain a triangular number (389403 = T₈₈₂).

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

The spelling of 389431 in words is "three hundred eighty-nine thousand, four hundred thirty-one".