686939125 has 32 divisors (see below), whose sum is σ = 880483968. Its totient is φ = 534902400.

The previous prime is 686939089. The next prime is 686939161. The reversal of 686939125 is 521939686.

It is an interprime number because it is at equal distance from previous prime (686939089) and next prime (686939161).

It is not a de Polignac number, because 686939125 - 2⁷ = 686938997 is a prime.

It is a super-2 number, since 2×686939125² = 943770722911531250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 756922 + ... + 757828.

It is an arithmetic number, because the mean of its divisors is an integer number (27515124).

Almost surely, 2^686939125 is an apocalyptic number.

It is an amenable number.

686939125 is a deficient number, since it is larger than the sum of its proper divisors (193544843).

686939125 is an equidigital number, since it uses as much as digits as its factorization.

686939125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078 (or 1068 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The square root of 686939125 is about 26209.5235553796. The cubic root of 686939125 is about 882.3470083370.

The spelling of 686939125 in words is "six hundred eighty-six million, nine hundred thirty-nine thousand, one hundred twenty-five".