189105804 has 18 divisors (see below), whose sum is σ = 478017540. Its totient is φ = 63035256.

The previous prime is 189105799. The next prime is 189105821. The reversal of 189105804 is 408501981.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×189105804² = 71522010212972832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5252939 = 189105804 / (1 + 8 + 9 + 1 + 0 + 5 + 8 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2626434 + ... + 2626505.

It is an arithmetic number, because the mean of its divisors is an integer number (26556530).

Almost surely, 2^189105804 is an apocalyptic number.

It is an amenable number.

189105804 is an abundant number, since it is smaller than the sum of its proper divisors (288911736).

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

189105804 is a wasteful number, since it uses less digits than its factorization.

189105804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252949 (or 5252944 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 189105804 is about 13751.5746007503. The cubic root of 189105804 is about 573.9864225645.

The spelling of 189105804 in words is "one hundred eighty-nine million, one hundred five thousand, eight hundred four".