189925128 has 32 divisors (see below), whose sum is σ = 527570400. Its totient is φ = 63308304.

The previous prime is 189925123. The next prime is 189925133. The reversal of 189925128 is 821529981.

It is an interprime number because it is at equal distance from previous prime (189925123) and next prime (189925133).

It is not an unprimeable number, because it can be changed into a prime (189925123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439426 + ... + 439857.

It is an arithmetic number, because the mean of its divisors is an integer number (16486575).

Almost surely, 2^189925128 is an apocalyptic number.

189925128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189925128 is an abundant number, since it is smaller than the sum of its proper divisors (337645272).

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

189925128 is a wasteful number, since it uses less digits than its factorization.

189925128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879298 (or 879288 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 189925128 is about 13781.3325915892. The cubic root of 189925128 is about 574.8141836886.

The spelling of 189925128 in words is "one hundred eighty-nine million, nine hundred twenty-five thousand, one hundred twenty-eight".