189045890 has 16 divisors (see below), whose sum is σ = 371217600. Its totient is φ = 68743920.

The previous prime is 189045887. The next prime is 189045911. The reversal of 189045890 is 98540981.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859190 + ... + 859409.

It is an arithmetic number, because the mean of its divisors is an integer number (23201100).

Almost surely, 2^189045890 is an apocalyptic number.

189045890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189045890 is a deficient number, since it is larger than the sum of its proper divisors (182171710).

189045890 is a wasteful number, since it uses less digits than its factorization.

189045890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718617.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 189045890 is about 13749.3959867334. The cubic root of 189045890 is about 573.9257978519.

The spelling of 189045890 in words is "one hundred eighty-nine million, forty-five thousand, eight hundred ninety".