1391899916 has 48 divisors (see below), whose sum is σ = 2727648000. Its totient is φ = 616127040.

The previous prime is 1391899913. The next prime is 1391899919. The reversal of 1391899916 is 6199981931.

It is an interprime number because it is at equal distance from previous prime (1391899913) and next prime (1391899919).

It is not an unprimeable number, because it can be changed into a prime (1391899913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280505 + ... + 285423.

It is an arithmetic number, because the mean of its divisors is an integer number (56826000).

Almost surely, 2^1391899916 is an apocalyptic number.

It is an amenable number.

1391899916 is a deficient number, since it is larger than the sum of its proper divisors (1335748084).

1391899916 is a wasteful number, since it uses less digits than its factorization.

1391899916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102 (or 5100 counting only the distinct ones).

The product of its digits is 944784, while the sum is 56.

The square root of 1391899916 is about 37308.1749218586. The cubic root of 1391899916 is about 1116.5272738259.

The spelling of 1391899916 in words is "one billion, three hundred ninety-one million, eight hundred ninety-nine thousand, nine hundred sixteen".