687437 has 2 divisors, whose sum is σ = 687438. Its totient is φ = 687436.

The previous prime is 687433. The next prime is 687443. The reversal of 687437 is 734786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 687241 + 196 = 829^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 687437 - 2² = 687433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687397 and 687406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343718 + 343719.

It is an arithmetic number, because the mean of its divisors is an integer number (343719).

2⁶⁸⁷⁴³⁷ is an apocalyptic number.

It is an amenable number.

687437 is a deficient number, since it is larger than the sum of its proper divisors (1).

687437 is an equidigital number, since it uses as much as digits as its factorization.

687437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 35.

The square root of 687437 is about 829.1182062891. The cubic root of 687437 is about 88.2560123984.

The spelling of 687437 in words is "six hundred eighty-seven thousand, four hundred thirty-seven".