686239479 has 16 divisors (see below), whose sum is σ = 1020413440. Its totient is φ = 455799960.

The previous prime is 686239417. The next prime is 686239513. The reversal of 686239479 is 974932686.

It is a happy number.

686239479 is a `hidden beast` number, since 6 + 8 + 623 + 9 + 4 + 7 + 9 = 666.

It is not a de Polignac number, because 686239479 - 2⁸ = 686239223 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 (686239079) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39577 + ... + 54210.

It is an arithmetic number, because the mean of its divisors is an integer number (63775840).

Almost surely, 2^686239479 is an apocalyptic number.

686239479 is a deficient number, since it is larger than the sum of its proper divisors (334173961).

686239479 is a wasteful number, since it uses less digits than its factorization.

686239479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94067 (or 94061 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 686239479 is about 26196.1729838540. The cubic root of 686239479 is about 882.0473504127.

The spelling of 686239479 in words is "six hundred eighty-six million, two hundred thirty-nine thousand, four hundred seventy-nine".