189143856 has 160 divisors (see below), whose sum is σ = 604247040. Its totient is φ = 56160000.

The previous prime is 189143849. The next prime is 189143863. The reversal of 189143856 is 658341981.

It is an interprime number because it is at equal distance from previous prime (189143849) and next prime (189143863).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251481 + ... + 252231.

It is an arithmetic number, because the mean of its divisors is an integer number (3776544).

Almost surely, 2^189143856 is an apocalyptic number.

189143856 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 189143856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302123520).

189143856 is an abundant number, since it is smaller than the sum of its proper divisors (415103184).

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

189143856 is a wasteful number, since it uses less digits than its factorization.

189143856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832 (or 820 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 189143856 is about 13752.9580818092. The cubic root of 189143856 is about 574.0249192968.

The spelling of 189143856 in words is "one hundred eighty-nine million, one hundred forty-three thousand, eight hundred fifty-six".