189866785 has 16 divisors (see below), whose sum is σ = 235625472. Its totient is φ = 146721600.

The previous prime is 189866749. The next prime is 189866813. The reversal of 189866785 is 587668981.

It is not a de Polignac number, because 189866785 - 2¹³ = 189858593 is a prime.

It is a Duffinian number.

Its product of digits (5806080) is a multiple of the sum of its prime divisors (2304).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136795 + ... + 138175.

It is an arithmetic number, because the mean of its divisors is an integer number (14726592).

Almost surely, 2^189866785 is an apocalyptic number.

It is an amenable number.

189866785 is a deficient number, since it is larger than the sum of its proper divisors (45758687).

189866785 is a wasteful number, since it uses less digits than its factorization.

189866785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2304.

The product of its digits is 5806080, while the sum is 58.

The square root of 189866785 is about 13779.2156888554. The cubic root of 189866785 is about 574.7553187052.

The spelling of 189866785 in words is "one hundred eighty-nine million, eight hundred sixty-six thousand, seven hundred eighty-five".