1899887994 has 32 divisors (see below), whose sum is σ = 4223399040. Its totient is φ = 633082176.

The previous prime is 1899887993. The next prime is 1899888019. The reversal of 1899887994 is 4997889981.

It is not an unprimeable number, because it can be changed into a prime (1899887993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300514 + ... + 306770.

It is an arithmetic number, because the mean of its divisors is an integer number (131981220).

Almost surely, 2^1899887994 is an apocalyptic number.

1899887994 is an abundant number, since it is smaller than the sum of its proper divisors (2323511046).

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

1899887994 is a wasteful number, since it uses less digits than its factorization.

1899887994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11891 (or 11885 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 72.

The square root of 1899887994 is about 43587.7046195369. The cubic root of 1899887994 is about 1238.5379911848.

The spelling of 1899887994 in words is "one billion, eight hundred ninety-nine million, eight hundred eighty-seven thousand, nine hundred ninety-four".