1391886881 has 16 divisors (see below), whose sum is σ = 1736432640. Its totient is φ = 1083904080.

The previous prime is 1391886851. The next prime is 1391886889. The reversal of 1391886881 is 1886881931.

It is not a de Polignac number, because 1391886881 - 2⁶ = 1391886817 is a prime.

It is a super-2 number, since 2×1391886881² = 3874698178999816322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391886889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142100 + ... + 151578.

It is an arithmetic number, because the mean of its divisors is an integer number (108527040).

Almost surely, 2^1391886881 is an apocalyptic number.

1391886881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1391886881 is a deficient number, since it is larger than the sum of its proper divisors (344545759).

1391886881 is a wasteful number, since it uses less digits than its factorization.

1391886881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11404.

The product of its digits is 663552, while the sum is 53.

The square root of 1391886881 is about 37308.0002278332. Note that the first 3 decimals coincide. The cubic root of 1391886881 is about 1116.5237884272.

The spelling of 1391886881 in words is "one billion, three hundred ninety-one million, eight hundred eighty-six thousand, eight hundred eighty-one".