189418866 has 144 divisors (see below), whose sum is σ = 508479552. Its totient is φ = 45800640.

The previous prime is 189418843. The next prime is 189418921. The reversal of 189418866 is 668814981.

189418866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6110271 + ... + 6110301.

It is an arithmetic number, because the mean of its divisors is an integer number (3531108).

Almost surely, 2^189418866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189418866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254239776).

189418866 is an abundant number, since it is smaller than the sum of its proper divisors (319060686).

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

189418866 is a wasteful number, since it uses less digits than its factorization.

189418866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 75 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 189418866 is about 13762.9526628555. The cubic root of 189418866 is about 574.3029900887.

The spelling of 189418866 in words is "one hundred eighty-nine million, four hundred eighteen thousand, eight hundred sixty-six".