231503640 has 32 divisors (see below), whose sum is σ = 694511280. Its totient is φ = 61734272.

The previous prime is 231503633. The next prime is 231503641. The reversal of 231503640 is 46305132.

It is a happy number.

It is a super-3 number, since 3×231503640³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 231503640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231503641) 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, 964479 + ... + 964718.

Almost surely, 2^231503640 is an apocalyptic number.

231503640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231503640 is an abundant number, since it is smaller than the sum of its proper divisors (463007640).

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

231503640 is a wasteful number, since it uses less digits than its factorization.

231503640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929211 (or 1929207 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 231503640 is about 15215.2436720547. The cubic root of 231503640 is about 614.0248409915.

Adding to 231503640 its reverse (46305132), we get a palindrome (277808772).

The spelling of 231503640 in words is "two hundred thirty-one million, five hundred three thousand, six hundred forty".