231439 has 8 divisors (see below), whose sum is σ = 262640. Its totient is φ = 202176.

The previous prime is 231433. The next prime is 231443. The reversal of 231439 is 934132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231439 - 2³ = 231431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431) 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, 222 + ... + 715.

It is an arithmetic number, because the mean of its divisors is an integer number (32830).

2²³¹⁴³⁹ is an apocalyptic number.

231439 is a deficient number, since it is larger than the sum of its proper divisors (31201).

231439 is a wasteful number, since it uses less digits than its factorization.

231439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 969.

The product of its digits is 648, while the sum is 22.

The square root of 231439 is about 481.0810742484. The cubic root of 231439 is about 61.3967686728.

The spelling of 231439 in words is "two hundred thirty-one thousand, four hundred thirty-nine".