1913891856 has 20 divisors (see below), whose sum is σ = 4944220752. Its totient is φ = 637963936.

The previous prime is 1913891809. The next prime is 1913891891. The reversal of 1913891856 is 6581983191.

It is a junction number, because it is equal to n+sod(n) for n = 1913891799 and 1913891808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19936326 + ... + 19936421.

Almost surely, 2^1913891856 is an apocalyptic number.

1913891856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1913891856 is an abundant number, since it is smaller than the sum of its proper divisors (3030328896).

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

1913891856 is a wasteful number, since it uses less digits than its factorization.

1913891856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39872758 (or 39872752 counting only the distinct ones).

The product of its digits is 466560, while the sum is 51.

The square root of 1913891856 is about 43748.0497393884. The cubic root of 1913891856 is about 1241.5735867005.

The spelling of 1913891856 in words is "one billion, nine hundred thirteen million, eight hundred ninety-one thousand, eight hundred fifty-six".