188891090 has 16 divisors (see below), whose sum is σ = 345079872. Its totient is φ = 74428464.

The previous prime is 188891089. The next prime is 188891093. The reversal of 188891090 is 90198881.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (188891093) 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, 140294 + ... + 141633.

It is an arithmetic number, because the mean of its divisors is an integer number (21567492).

Almost surely, 2^188891090 is an apocalyptic number.

188891090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188891090 is a deficient number, since it is larger than the sum of its proper divisors (156188782).

188891090 is a wasteful number, since it uses less digits than its factorization.

188891090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282001.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 188891090 is about 13743.7654956711. The cubic root of 188891090 is about 573.7691022573.

The spelling of 188891090 in words is "one hundred eighty-eight million, eight hundred ninety-one thousand, ninety".