687423 has 16 divisors (see below), whose sum is σ = 1028736. Its totient is φ = 404640.

The previous prime is 687413. The next prime is 687431. The reversal of 687423 is 324786.

It is not a de Polignac number, because 687423 - 2⁶ = 687359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940 + ... + 1502.

It is an arithmetic number, because the mean of its divisors is an integer number (64296).

2⁶⁸⁷⁴²³ is an apocalyptic number.

687423 is a deficient number, since it is larger than the sum of its proper divisors (341313).

687423 is a wasteful number, since it uses less digits than its factorization.

687423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614.

The product of its digits is 8064, while the sum is 30.

The square root of 687423 is about 829.1097635416. The cubic root of 687423 is about 88.2554132684.

The spelling of 687423 in words is "six hundred eighty-seven thousand, four hundred twenty-three".