861392345 has 12 divisors (see below), whose sum is σ = 1136184420. Its totient is φ = 626466720.

The previous prime is 861392339. The next prime is 861392369. The reversal of 861392345 is 543293168.

It can be written as a sum of positive squares in 2 ways, for example, as 519475264 + 341917081 = 22792^2 + 18491^2 .

It is not a de Polignac number, because 861392345 - 2¹⁴ = 861375961 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 711290 + ... + 712499.

It is an arithmetic number, because the mean of its divisors is an integer number (94682035).

Almost surely, 2^861392345 is an apocalyptic number.

It is an amenable number.

861392345 is a deficient number, since it is larger than the sum of its proper divisors (274792075).

861392345 is a wasteful number, since it uses less digits than its factorization.

861392345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423816 (or 1423805 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 861392345 is about 29349.4862817052. The cubic root of 861392345 is about 951.4814724582.

The spelling of 861392345 in words is "eight hundred sixty-one million, three hundred ninety-two thousand, three hundred forty-five".