189445090 has 16 divisors (see below), whose sum is σ = 341393472. Its totient is φ = 75690864.

The previous prime is 189445073. The next prime is 189445097. The reversal of 189445090 is 90544981.

It is not an unprimeable number, because it can be changed into a prime (189445097) 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, 1374 + ... + 19513.

It is an arithmetic number, because the mean of its divisors is an integer number (21337092).

Almost surely, 2^189445090 is an apocalyptic number.

189445090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189445090 is a deficient number, since it is larger than the sum of its proper divisors (151948382).

189445090 is a wasteful number, since it uses less digits than its factorization.

189445090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21801.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 189445090 is about 13763.9053324265. The cubic root of 189445090 is about 574.3294918957.

The spelling of 189445090 in words is "one hundred eighty-nine million, four hundred forty-five thousand, ninety".