1391985912 has 32 divisors (see below), whose sum is σ = 3481027200. Its totient is φ = 463853664.

The previous prime is 1391985911. The next prime is 1391985937. The reversal of 1391985912 is 2195891931.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391985911) 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, 97453 + ... + 110819.

It is an arithmetic number, because the mean of its divisors is an integer number (108782100).

Almost surely, 2^1391985912 is an apocalyptic number.

1391985912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1391985912 is an abundant number, since it is smaller than the sum of its proper divisors (2089041288).

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

1391985912 is a wasteful number, since it uses less digits than its factorization.

1391985912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17715 (or 17711 counting only the distinct ones).

The product of its digits is 174960, while the sum is 48.

The square root of 1391985912 is about 37309.3274128602. The cubic root of 1391985912 is about 1116.5502675534.

The spelling of 1391985912 in words is "one billion, three hundred ninety-one million, nine hundred eighty-five thousand, nine hundred twelve".