861692389 has 4 divisors (see below), whose sum is σ = 907044640. Its totient is φ = 816340140.

The previous prime is 861692387. The next prime is 861692417. The reversal of 861692389 is 983296168.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 861692389 - 2¹ = 861692387 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 (861692383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22676097 + ... + 22676134.

It is an arithmetic number, because the mean of its divisors is an integer number (226761160).

Almost surely, 2^861692389 is an apocalyptic number.

It is an amenable number.

861692389 is a deficient number, since it is larger than the sum of its proper divisors (45352251).

861692389 is a wasteful number, since it uses less digits than its factorization.

861692389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45352250.

The product of its digits is 1119744, while the sum is 52.

The square root of 861692389 is about 29354.5974082425. The cubic root of 861692389 is about 951.5919343818.

The spelling of 861692389 in words is "eight hundred sixty-one million, six hundred ninety-two thousand, three hundred eighty-nine".