189020730 has 32 divisors (see below), whose sum is σ = 455393664. Its totient is φ = 50211776.

The previous prime is 189020729. The next prime is 189020749. The reversal of 189020730 is 37020981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4089 + ... + 19868.

It is an arithmetic number, because the mean of its divisors is an integer number (14231052).

Almost surely, 2^189020730 is an apocalyptic number.

189020730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189020730 is an abundant number, since it is smaller than the sum of its proper divisors (266372934).

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

189020730 is a wasteful number, since it uses less digits than its factorization.

189020730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24230.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 189020730 is about 13748.4810070058. The cubic root of 189020730 is about 573.9003355797.

The spelling of 189020730 in words is "one hundred eighty-nine million, twenty thousand, seven hundred thirty".