189128912 has 20 divisors (see below), whose sum is σ = 418785696. Its totient is φ = 81055200.

The previous prime is 189128903. The next prime is 189128917. The reversal of 189128912 is 219821981.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 189128912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189128917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844214 + ... + 844437.

Almost surely, 2^189128912 is an apocalyptic number.

It is an amenable number.

189128912 is an abundant number, since it is smaller than the sum of its proper divisors (229656784).

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

189128912 is a wasteful number, since it uses less digits than its factorization.

189128912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688666 (or 1688660 counting only the distinct ones).

The product of its digits is 20736, while the sum is 41.

The square root of 189128912 is about 13752.4147697777. The cubic root of 189128912 is about 574.0098012547.

It can be divided in two parts, 1891 and 28912, that added together give a palindrome (30803).

The spelling of 189128912 in words is "one hundred eighty-nine million, one hundred twenty-eight thousand, nine hundred twelve".