1231232320 has 112 divisors (see below), whose sum is σ = 3085112448. Its totient is φ = 467118080.

The previous prime is 1231232311. The next prime is 1231232333. The reversal of 1231232320 is 232321321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 963522 + ... + 964798.

Almost surely, 2^1231232320 is an apocalyptic number.

1231232320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231232320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1542556224).

1231232320 is an abundant number, since it is smaller than the sum of its proper divisors (1853880128).

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

1231232320 is a wasteful number, since it uses less digits than its factorization.

1231232320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 1438 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1231232320 is about 35088.9201885723. The cubic root of 1231232320 is about 1071.7989709919.

Adding to 1231232320 its reverse (232321321), we get a palindrome (1463553641).

The spelling of 1231232320 in words is "one billion, two hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty".