1320391420 has 12 divisors (see below), whose sum is σ = 2772822024. Its totient is φ = 528156560.

The previous prime is 1320391393. The next prime is 1320391459. The reversal of 1320391420 is 241930231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33009766 + ... + 33009805.

It is an arithmetic number, because the mean of its divisors is an integer number (231068502).

Almost surely, 2^1320391420 is an apocalyptic number.

1320391420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320391420 is an abundant number, since it is smaller than the sum of its proper divisors (1452430604).

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

1320391420 is a wasteful number, since it uses less digits than its factorization.

1320391420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66019580 (or 66019578 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1320391420 is about 36337.1905903580. The cubic root of 1320391420 is about 1097.0697271942.

The spelling of 1320391420 in words is "one billion, three hundred twenty million, three hundred ninety-one thousand, four hundred twenty".