1391620812 has 24 divisors (see below), whose sum is σ = 3249750000. Its totient is φ = 463497216.

The previous prime is 1391620757. The next prime is 1391620817. The reversal of 1391620812 is 2180261931.

It is not an unprimeable number, because it can be changed into a prime (1391620817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31437 + ... + 61412.

It is an arithmetic number, because the mean of its divisors is an integer number (135406250).

Almost surely, 2^1391620812 is an apocalyptic number.

1391620812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1391620812 is an abundant number, since it is smaller than the sum of its proper divisors (1858129188).

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

1391620812 is a wasteful number, since it uses less digits than its factorization.

1391620812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94105 (or 94103 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1391620812 is about 37304.4342136428. The cubic root of 1391620812 is about 1116.4526400929.

The spelling of 1391620812 in words is "one billion, three hundred ninety-one million, six hundred twenty thousand, eight hundred twelve".