189731630 has 48 divisors (see below), whose sum is σ = 388402560. Its totient is φ = 66601920.

The previous prime is 189731629. The next prime is 189731657. The reversal of 189731630 is 36137981.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

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, 32387 + ... + 37793.

It is an arithmetic number, because the mean of its divisors is an integer number (8091720).

Almost surely, 2^189731630 is an apocalyptic number.

189731630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189731630 is an abundant number, since it is smaller than the sum of its proper divisors (198670930).

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

189731630 is a wasteful number, since it uses less digits than its factorization.

189731630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465 (or 5454 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 189731630 is about 13774.3105090600. The cubic root of 189731630 is about 574.6189081607.

The spelling of 189731630 in words is "one hundred eighty-nine million, seven hundred thirty-one thousand, six hundred thirty".