1231030320 has 160 divisors (see below), whose sum is σ = 4122902784. Its totient is φ = 302054400.

The previous prime is 1231030291. The next prime is 1231030327. The reversal of 1231030320 is 230301321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1231030320.

It is not an unprimeable number, because it can be changed into a prime (1231030327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1781175 + ... + 1781865.

Almost surely, 2^1231030320 is an apocalyptic number.

1231030320 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 1231030320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061451392).

1231030320 is an abundant number, since it is smaller than the sum of its proper divisors (2891872464).

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

1231030320 is a wasteful number, since it uses less digits than its factorization.

1231030320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 1231030320 is about 35086.0416690170. The cubic root of 1231030320 is about 1071.7403535049.

Adding to 1231030320 its reverse (230301321), we get a palindrome (1461331641).

The spelling of 1231030320 in words is "one billion, two hundred thirty-one million, thirty thousand, three hundred twenty".