231390 has 32 divisors (see below), whose sum is σ = 617760. Its totient is φ = 61632.

The previous prime is 231379. The next prime is 231409. The reversal of 231390 is 93132.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

231390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159 + ... + 698.

It is an arithmetic number, because the mean of its divisors is an integer number (19305).

2²³¹³⁹⁰ is an apocalyptic number.

231390 is an abundant number, since it is smaller than the sum of its proper divisors (386370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231390 is a wasteful number, since it uses less digits than its factorization.

231390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 231390 is about 481.0301445856. The cubic root of 231390 is about 61.3924354158.

The spelling of 231390 in words is "two hundred thirty-one thousand, three hundred ninety".