189959980 has 24 divisors (see below), whose sum is σ = 455904288. Its totient is φ = 65129088.

The previous prime is 189959969. The next prime is 189959983. The reversal of 189959980 is 89959981.

It is a happy number.

189959980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (189959983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678289 + ... + 678568.

It is an arithmetic number, because the mean of its divisors is an integer number (18996012).

Almost surely, 2^189959980 is an apocalyptic number.

189959980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189959980 is an abundant number, since it is smaller than the sum of its proper divisors (265944308).

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

189959980 is a wasteful number, since it uses less digits than its factorization.

189959980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356873 (or 1356871 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 58.

The square root of 189959980 is about 13782.5969976634. The cubic root of 189959980 is about 574.8493417513.

Subtracting from 189959980 its reverse (89959981), we obtain a palindrome (99999999).

The spelling of 189959980 in words is "one hundred eighty-nine million, nine hundred fifty-nine thousand, nine hundred eighty".