1391381808 has 40 divisors (see below), whose sum is σ = 3595768368. Its totient is φ = 463617792.

The previous prime is 1391381791. The next prime is 1391381833. The reversal of 1391381808 is 8081831931.

It is a self number, because there is not a number n which added to its sum of digits gives 1391381808.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205810 + ... + 212462.

Almost surely, 2^1391381808 is an apocalyptic number.

It is an amenable number.

1391381808 is an abundant number, since it is smaller than the sum of its proper divisors (2204386560).

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

1391381808 is a wasteful number, since it uses less digits than its factorization.

1391381808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11021 (or 11015 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1391381808 is about 37301.2306499397. The cubic root of 1391381808 is about 1116.3887213583.

The spelling of 1391381808 in words is "one billion, three hundred ninety-one million, three hundred eighty-one thousand, eight hundred eight".