189637920 has 144 divisors (see below), whose sum is σ = 655724160. Its totient is φ = 49900032.

The previous prime is 189637901. The next prime is 189637933. The reversal of 189637920 is 29736981.

189637920 is a `hidden beast` number, since 1 + 8 + 9 + 637 + 9 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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 23 ways as a sum of consecutive naturals, for example, 112927 + ... + 114593.

It is an arithmetic number, because the mean of its divisors is an integer number (4553640).

Almost surely, 2^189637920 is an apocalyptic number.

189637920 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 189637920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327862080).

189637920 is an abundant number, since it is smaller than the sum of its proper divisors (466086240).

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

189637920 is a wasteful number, since it uses less digits than its factorization.

189637920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1756 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 189637920 is about 13770.9084667643. The cubic root of 189637920 is about 574.5242895924.

The spelling of 189637920 in words is "one hundred eighty-nine million, six hundred thirty-seven thousand, nine hundred twenty".