685884379 has 4 divisors (see below), whose sum is σ = 686002176. Its totient is φ = 685766584.

The previous prime is 685884377. The next prime is 685884391. The reversal of 685884379 is 973488586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685884379 - 2¹ = 685884377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685884373) 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, 49684 + ... + 61969.

It is an arithmetic number, because the mean of its divisors is an integer number (171500544).

Almost surely, 2^685884379 is an apocalyptic number.

685884379 is a deficient number, since it is larger than the sum of its proper divisors (117797).

685884379 is a wasteful number, since it uses less digits than its factorization.

685884379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117796.

The product of its digits is 11612160, while the sum is 58.

The square root of 685884379 is about 26189.3943992602. The cubic root of 685884379 is about 881.8951833902.

The spelling of 685884379 in words is "six hundred eighty-five million, eight hundred eighty-four thousand, three hundred seventy-nine".