1391889000 has 64 divisors (see below), whose sum is σ = 4342703040. Its totient is φ = 371169600.

The previous prime is 1391888941. The next prime is 1391889019. The reversal of 1391889000 is 9881931.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391889000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228982 + ... + 234981.

It is an arithmetic number, because the mean of its divisors is an integer number (67854735).

Almost surely, 2^1391889000 is an apocalyptic number.

1391889000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391889000 is an abundant number, since it is smaller than the sum of its proper divisors (2950814040).

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

1391889000 is a wasteful number, since it uses less digits than its factorization.

1391889000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463987 (or 463973 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 1391889000 is about 37308.0286265570. The cubic root of 1391889000 is about 1116.5243550232.

The spelling of 1391889000 in words is "one billion, three hundred ninety-one million, eight hundred eighty-nine thousand".