861924189 has 16 divisors (see below), whose sum is σ = 1382535680. Its totient is φ = 466605360.

The previous prime is 861924163. The next prime is 861924199. The reversal of 861924189 is 981429168.

It is a de Polignac number, because none of the positive numbers 2^k-861924189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861924199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079707 + ... + 1080504.

It is an arithmetic number, because the mean of its divisors is an integer number (86408480).

Almost surely, 2^861924189 is an apocalyptic number.

It is an amenable number.

861924189 is a deficient number, since it is larger than the sum of its proper divisors (520611491).

861924189 is a wasteful number, since it uses less digits than its factorization.

861924189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160240.

The product of its digits is 248832, while the sum is 48.

The square root of 861924189 is about 29358.5454169651. The cubic root of 861924189 is about 951.6772545560.

The spelling of 861924189 in words is "eight hundred sixty-one million, nine hundred twenty-four thousand, one hundred eighty-nine".