189997056 has 112 divisors (see below), whose sum is σ = 563575200. Its totient is φ = 63258624.

The previous prime is 189997019. The next prime is 189997063. The reversal of 189997056 is 650799981.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 189996993 and 189997011.

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, 220755 + ... + 221613.

Almost surely, 2^189997056 is an apocalyptic number.

189997056 is a gapful number since it is divisible by the number (16) 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 189997056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281787600).

189997056 is an abundant number, since it is smaller than the sum of its proper divisors (373578144).

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

189997056 is an frugal number, since it uses more digits than its factorization.

189997056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 864 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 189997056 is about 13783.9419615725. The cubic root of 189997056 is about 574.8867386242.

The spelling of 189997056 in words is "one hundred eighty-nine million, nine hundred ninety-seven thousand, fifty-six".