231940 has 12 divisors (see below), whose sum is σ = 487116. Its totient is φ = 92768.

The previous prime is 231923. The next prime is 231943. The reversal of 231940 is 49132.

It can be written as a sum of positive squares in 2 ways, for example, as 148996 + 82944 = 386^2 + 288^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (231943) 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, 5779 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (40593).

2²³¹⁹⁴⁰ is an apocalyptic number.

231940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231940 is an abundant number, since it is smaller than the sum of its proper divisors (255176).

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

231940 is a wasteful number, since it uses less digits than its factorization.

231940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11606 (or 11604 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231940 is about 481.6014950143. The cubic root of 231940 is about 61.4410389590.

The spelling of 231940 in words is "two hundred thirty-one thousand, nine hundred forty".