189917705 has 16 divisors (see below), whose sum is σ = 233508864. Its totient is φ = 148236480.

The previous prime is 189917639. The next prime is 189917743. The reversal of 189917705 is 507719981.

It is not a de Polignac number, because 189917705 - 2¹⁴ = 189901321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189917705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36284 + ... + 41186.

It is an arithmetic number, because the mean of its divisors is an integer number (14594304).

Almost surely, 2^189917705 is an apocalyptic number.

It is an amenable number.

189917705 is a deficient number, since it is larger than the sum of its proper divisors (43591159).

189917705 is a wasteful number, since it uses less digits than its factorization.

189917705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096.

The product of its (nonzero) digits is 158760, while the sum is 47.

The square root of 189917705 is about 13781.0632753790. The cubic root of 189917705 is about 574.8066949459.

The spelling of 189917705 in words is "one hundred eighty-nine million, nine hundred seventeen thousand, seven hundred five".