189686640 has 160 divisors (see below), whose sum is σ = 690955776. Its totient is φ = 42439680.

The previous prime is 189686639. The next prime is 189686647. The reversal of 189686640 is 46686981.

189686640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 189686640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189686647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31557 + ... + 37083.

Almost surely, 2^189686640 is an apocalyptic number.

189686640 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 189686640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345477888).

189686640 is an abundant number, since it is smaller than the sum of its proper divisors (501269136).

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

189686640 is a wasteful number, since it uses less digits than its factorization.

189686640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567 (or 5561 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 189686640 is about 13772.6772996393. The cubic root of 189686640 is about 574.5734858479.

The spelling of 189686640 in words is "one hundred eighty-nine million, six hundred eighty-six thousand, six hundred forty".