686039789 has 4 divisors (see below), whose sum is σ = 686280960. Its totient is φ = 685798620.

The previous prime is 686039771. The next prime is 686039797. The reversal of 686039789 is 987930686.

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 686039789 - 2²⁰ = 684991213 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 (686039719) 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, 116267 + ... + 122024.

It is an arithmetic number, because the mean of its divisors is an integer number (171570240).

Almost surely, 2^686039789 is an apocalyptic number.

It is an amenable number.

686039789 is a deficient number, since it is larger than the sum of its proper divisors (241171).

686039789 is a wasteful number, since it uses less digits than its factorization.

686039789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241170.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 686039789 is about 26192.3612719434. The cubic root of 686039789 is about 881.9617859568.

The spelling of 686039789 in words is "six hundred eighty-six million, thirty-nine thousand, seven hundred eighty-nine".