1990890855 has 48 divisors (see below), whose sum is σ = 3515694624. Its totient is φ = 1041949440.

The previous prime is 1990890829. The next prime is 1990890877. The reversal of 1990890855 is 5580980991.

It is not a de Polignac number, because 1990890855 - 2⁵ = 1990890823 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2269677 + ... + 2270553.

It is an arithmetic number, because the mean of its divisors is an integer number (73243638).

Almost surely, 2^1990890855 is an apocalyptic number.

1990890855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1990890855 is a deficient number, since it is larger than the sum of its proper divisors (1524803769).

1990890855 is a wasteful number, since it uses less digits than its factorization.

1990890855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The square root of 1990890855 is about 44619.3999847600. The cubic root of 1990890855 is about 1258.0053379395.

The spelling of 1990890855 in words is "one billion, nine hundred ninety million, eight hundred ninety thousand, eight hundred fifty-five".