189799866 has 24 divisors (see below), whose sum is σ = 435423924. Its totient is φ = 59544960.

The previous prime is 189799861. The next prime is 189799871. The reversal of 189799866 is 668997981.

189799866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189799861) and next prime (189799871).

It can be written as a sum of positive squares in 2 ways, for example, as 170694225 + 19105641 = 13065^2 + 4371^2 .

It is not an unprimeable number, because it can be changed into a prime (189799861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309825 + ... + 310436.

Almost surely, 2^189799866 is an apocalyptic number.

189799866 is an abundant number, since it is smaller than the sum of its proper divisors (245624058).

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

189799866 is a wasteful number, since it uses less digits than its factorization.

189799866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620286 (or 620283 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 189799866 is about 13776.7872161836. The cubic root of 189799866 is about 574.6877861442.

The spelling of 189799866 in words is "one hundred eighty-nine million, seven hundred ninety-nine thousand, eight hundred sixty-six".