189621980 has 12 divisors (see below), whose sum is σ = 398206200. Its totient is φ = 75848784.

The previous prime is 189621979. The next prime is 189621983. The reversal of 189621980 is 89126981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189621983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4740530 + ... + 4740569.

It is an arithmetic number, because the mean of its divisors is an integer number (33183850).

Almost surely, 2^189621980 is an apocalyptic number.

189621980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189621980 is an abundant number, since it is smaller than the sum of its proper divisors (208584220).

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

189621980 is a wasteful number, since it uses less digits than its factorization.

189621980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9481108 (or 9481106 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 189621980 is about 13770.3296983042. The cubic root of 189621980 is about 574.5081919438.

The spelling of 189621980 in words is "one hundred eighty-nine million, six hundred twenty-one thousand, nine hundred eighty".