189931280 has 120 divisors (see below), whose sum is σ = 554922816. Its totient is φ = 59178240.

The previous prime is 189931243. The next prime is 189931303. The reversal of 189931280 is 82139981.

It is a super-2 number, since 2×189931280² = 72147782244876800, which contains 22 as substring.

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, 66359 + ... + 69161.

Almost surely, 2^189931280 is an apocalyptic number.

189931280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189931280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277461408).

189931280 is an abundant number, since it is smaller than the sum of its proper divisors (364991536).

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

189931280 is a wasteful number, since it uses less digits than its factorization.

189931280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845 (or 2828 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 189931280 is about 13781.5557902582. Note that the first 3 decimals coincide. The cubic root of 189931280 is about 574.8203900267.

The spelling of 189931280 in words is "one hundred eighty-nine million, nine hundred thirty-one thousand, two hundred eighty".