189279820 has 12 divisors (see below), whose sum is σ = 397487664. Its totient is φ = 75711920.

The previous prime is 189279817. The next prime is 189279841. The reversal of 189279820 is 28972981.

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, 4731976 + ... + 4732015.

It is an arithmetic number, because the mean of its divisors is an integer number (33123972).

Almost surely, 2^189279820 is an apocalyptic number.

189279820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189279820 is an abundant number, since it is smaller than the sum of its proper divisors (208207844).

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

189279820 is a wasteful number, since it uses less digits than its factorization.

189279820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9464000 (or 9463998 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 189279820 is about 13757.9002758415. The cubic root of 189279820 is about 574.1624302055.

The spelling of 189279820 in words is "one hundred eighty-nine million, two hundred seventy-nine thousand, eight hundred twenty".