1899139806 has 48 divisors (see below), whose sum is σ = 4229761536. Its totient is φ = 615495888.

The previous prime is 1899139799. The next prime is 1899139829. The reversal of 1899139806 is 6089319981.

1899139806 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167101 + ... + 178103.

It is an arithmetic number, because the mean of its divisors is an integer number (88120032).

Almost surely, 2^1899139806 is an apocalyptic number.

1899139806 is an abundant number, since it is smaller than the sum of its proper divisors (2330621730).

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

1899139806 is a wasteful number, since it uses less digits than its factorization.

1899139806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11277 (or 11274 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 1899139806 is about 43579.1212164725. The cubic root of 1899139806 is about 1238.3753884536.

The spelling of 1899139806 in words is "one billion, eight hundred ninety-nine million, one hundred thirty-nine thousand, eight hundred six".