189886720 has 72 divisors (see below), whose sum is σ = 459348120. Its totient is φ = 75202560.

The previous prime is 189886709. The next prime is 189886747. The reversal of 189886720 is 27688981.

It can be written as a sum of positive squares in 4 ways, for example, as 10969344 + 178917376 = 3312^2 + 13376^2 .

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, 138840 + ... + 140200.

It is an arithmetic number, because the mean of its divisors is an integer number (6379835).

Almost surely, 2^189886720 is an apocalyptic number.

189886720 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 189886720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229674060).

189886720 is an abundant number, since it is smaller than the sum of its proper divisors (269461400).

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

189886720 is a wasteful number, since it uses less digits than its factorization.

189886720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 189886720 is about 13779.9390419552. The cubic root of 189886720 is about 574.7754334158.

The spelling of 189886720 in words is "one hundred eighty-nine million, eight hundred eighty-six thousand, seven hundred twenty".