189173880 has 320 divisors, whose sum is σ = 766656000. Its totient is φ = 40870656.

The previous prime is 189173851. The next prime is 189173893. The reversal of 189173880 is 88371981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 430701 + ... + 431139.

It is an arithmetic number, because the mean of its divisors is an integer number (2395800).

Almost surely, 2^189173880 is an apocalyptic number.

189173880 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 189173880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383328000).

189173880 is an abundant number, since it is smaller than the sum of its proper divisors (577482120).

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

189173880 is a wasteful number, since it uses less digits than its factorization.

189173880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 189173880 is about 13754.0495854857. The cubic root of 189173880 is about 574.0552905579.

The spelling of 189173880 in words is "one hundred eighty-nine million, one hundred seventy-three thousand, eight hundred eighty".