1231479920 has 60 divisors (see below), whose sum is σ = 3147168360. Its totient is φ = 447807360.

The previous prime is 1231479901. The next prime is 1231479937. The reversal of 1231479920 is 299741321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53930 + ... + 73289.

It is an arithmetic number, because the mean of its divisors is an integer number (52452806).

Almost surely, 2^1231479920 is an apocalyptic number.

1231479920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231479920 is an abundant number, since it is smaller than the sum of its proper divisors (1915688440).

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

1231479920 is a wasteful number, since it uses less digits than its factorization.

1231479920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127254 (or 127237 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1231479920 is about 35092.4481904583. The cubic root of 1231479920 is about 1071.8708121962.

The spelling of 1231479920 in words is "one billion, two hundred thirty-one million, four hundred seventy-nine thousand, nine hundred twenty".