189742890 has 32 divisors (see below), whose sum is σ = 455746176. Its totient is φ = 50557760.

The previous prime is 189742877. The next prime is 189742907. The reversal of 189742890 is 98247981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68635 + ... + 71345.

It is an arithmetic number, because the mean of its divisors is an integer number (14242068).

Almost surely, 2^189742890 is an apocalyptic number.

189742890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189742890 is an abundant number, since it is smaller than the sum of its proper divisors (266003286).

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

189742890 is a wasteful number, since it uses less digits than its factorization.

189742890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 189742890 is about 13774.7192348882. The cubic root of 189742890 is about 574.6302752355.

The spelling of 189742890 in words is "one hundred eighty-nine million, seven hundred forty-two thousand, eight hundred ninety".