189691808 has 24 divisors (see below), whose sum is σ = 373945572. Its totient is φ = 94721536.

The previous prime is 189691783. The next prime is 189691811. The reversal of 189691808 is 808196981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 169728784 + 19963024 = 13028^2 + 4468^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23966 + ... + 30882.

Almost surely, 2^189691808 is an apocalyptic number.

It is an amenable number.

189691808 is a deficient number, since it is larger than the sum of its proper divisors (184253764).

189691808 is an equidigital number, since it uses as much as digits as its factorization.

189691808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7784 (or 7776 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 50.

The square root of 189691808 is about 13772.8649162039. The cubic root of 189691808 is about 574.5787038728.

The spelling of 189691808 in words is "one hundred eighty-nine million, six hundred ninety-one thousand, eight hundred eight".