189077840172 has 108 divisors (see below), whose sum is σ = 525265595400. Its totient is φ = 57309348096.

The previous prime is 189077840137. The next prime is 189077840173. The reversal of 189077840172 is 271048770981.

189077840172 is a `hidden beast` number, since 18 + 90 + 7 + 78 + 401 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (189077840173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 175704 + ... + 639552.

Almost surely, 2^189077840172 is an apocalyptic number.

189077840172 is a gapful number since it is divisible by the number (12) 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 189077840172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262632797700).

189077840172 is an abundant number, since it is smaller than the sum of its proper divisors (336187755228).

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

189077840172 is a wasteful number, since it uses less digits than its factorization.

189077840172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463952 (or 463934 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 189077840172 in words is "one hundred eighty-nine billion, seventy-seven million, eight hundred forty thousand, one hundred seventy-two".