189391980 has 24 divisors (see below), whose sum is σ = 530297712. Its totient is φ = 50504512.

The previous prime is 189391933. The next prime is 189391991. The reversal of 189391980 is 89193981.

189391980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1578207 + ... + 1578326.

It is an arithmetic number, because the mean of its divisors is an integer number (22095738).

Almost surely, 2^189391980 is an apocalyptic number.

189391980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189391980 is an abundant number, since it is smaller than the sum of its proper divisors (340905732).

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

189391980 is a wasteful number, since it uses less digits than its factorization.

189391980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156545 (or 3156543 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 48.

The square root of 189391980 is about 13761.9758755783. The cubic root of 189391980 is about 574.2758167293.

The spelling of 189391980 in words is "one hundred eighty-nine million, three hundred ninety-one thousand, nine hundred eighty".