686926438 has 20 divisors (see below), whose sum is σ = 1133469900. Its totient is φ = 312225980.

The previous prime is 686926433. The next prime is 686926459. The reversal of 686926438 is 834629686.

686926438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686926433) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17553 + ... + 41011.

It is an arithmetic number, because the mean of its divisors is an integer number (56673495).

Almost surely, 2^686926438 is an apocalyptic number.

686926438 is a deficient number, since it is larger than the sum of its proper divisors (446543462).

686926438 is an equidigital number, since it uses as much as digits as its factorization.

686926438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23505 (or 23472 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 52.

The square root of 686926438 is about 26209.2815239182. The cubic root of 686926438 is about 882.3415763150.

The spelling of 686926438 in words is "six hundred eighty-six million, nine hundred twenty-six thousand, four hundred thirty-eight".