1231215432 has 16 divisors (see below), whose sum is σ = 3078038640. Its totient is φ = 410405136.

The previous prime is 1231215413. The next prime is 1231215439. The reversal of 1231215432 is 2345121321.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 51300643 = 1231215432 / (1 + 2 + 3 + 1 + 2 + 1 + 5 + 4 + 3 + 2).

It is not an unprimeable number, because it can be changed into a prime (1231215439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25650298 + ... + 25650345.

It is an arithmetic number, because the mean of its divisors is an integer number (192377415).

Almost surely, 2^1231215432 is an apocalyptic number.

1231215432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231215432 is an abundant number, since it is smaller than the sum of its proper divisors (1846823208).

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

1231215432 is a wasteful number, since it uses less digits than its factorization.

1231215432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51300652 (or 51300648 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 1231215432 is about 35088.6795419833. The cubic root of 1231215432 is about 1071.7940705834.

Adding to 1231215432 its reverse (2345121321), we get a palindrome (3576336753).

The spelling of 1231215432 in words is "one billion, two hundred thirty-one million, two hundred fifteen thousand, four hundred thirty-two".