231281240 has 16 divisors (see below), whose sum is σ = 520382880. Its totient is φ = 92512480.

The previous prime is 231281233. The next prime is 231281263. The reversal of 231281240 is 42182132.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2890976 + ... + 2891055.

It is an arithmetic number, because the mean of its divisors is an integer number (32523930).

Almost surely, 2^231281240 is an apocalyptic number.

231281240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231281240 is an abundant number, since it is smaller than the sum of its proper divisors (289101640).

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

231281240 is a wasteful number, since it uses less digits than its factorization.

231281240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782042 (or 5782038 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 231281240 is about 15207.9334559302. The cubic root of 231281240 is about 613.8281516757.

The spelling of 231281240 in words is "two hundred thirty-one million, two hundred eighty-one thousand, two hundred forty".