231406520 has 32 divisors (see below), whose sum is σ = 521845200. Its totient is φ = 92352768.

The previous prime is 231406517. The next prime is 231406523. The reversal of 231406520 is 25604132.

It is an interprime number because it is at equal distance from previous prime (231406517) and next prime (231406523).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231406523) 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, 11951 + ... + 24609.

Almost surely, 2^231406520 is an apocalyptic number.

231406520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231406520 is an abundant number, since it is smaller than the sum of its proper divisors (290438680).

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

231406520 is a wasteful number, since it uses less digits than its factorization.

231406520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13127 (or 13123 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 231406520 is about 15212.0518011214. The cubic root of 231406520 is about 613.9389641076.

The spelling of 231406520 in words is "two hundred thirty-one million, four hundred six thousand, five hundred twenty".