687197439 has 12 divisors (see below), whose sum is σ = 1029382536. Its totient is φ = 458131464.

The previous prime is 687197383. The next prime is 687197449. The reversal of 687197439 is 934791786.

It is a happy number.

It is not a de Polignac number, because 687197439 - 2⁹ = 687196927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687197449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1413744 + ... + 1414229.

It is an arithmetic number, because the mean of its divisors is an integer number (85781878).

Almost surely, 2^687197439 is an apocalyptic number.

687197439 is a deficient number, since it is larger than the sum of its proper divisors (342185097).

687197439 is an equidigital number, since it uses as much as digits as its factorization.

687197439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827988 (or 2827976 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 687197439 is about 26214.4509574395. The cubic root of 687197439 is about 882.4575926250.

The spelling of 687197439 in words is "six hundred eighty-seven million, one hundred ninety-seven thousand, four hundred thirty-nine".