189509856 has 48 divisors (see below), whose sum is σ = 510917904. Its totient is φ = 61461504.

The previous prime is 189509849. The next prime is 189509869. The reversal of 189509856 is 658905981.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×189509856² = 71827971042281472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189509799 and 189509808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23125 + ... + 30228.

It is an arithmetic number, because the mean of its divisors is an integer number (10644123).

Almost surely, 2^189509856 is an apocalyptic number.

189509856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

189509856 is an abundant number, since it is smaller than the sum of its proper divisors (321408048).

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

189509856 is a wasteful number, since it uses less digits than its factorization.

189509856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53403 (or 53395 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 189509856 is about 13766.2578793222. The cubic root of 189509856 is about 574.3949335245.

The spelling of 189509856 in words is "one hundred eighty-nine million, five hundred nine thousand, eight hundred fifty-six".