697684 has 12 divisors (see below), whose sum is σ = 1314964. Its totient is φ = 321984.

The previous prime is 697681. The next prime is 697687. The reversal of 697684 is 486796.

It is an interprime number because it is at equal distance from previous prime (697681) and next prime (697687).

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 521284 = 420^2 + 722^2 .

It is a nialpdrome in base 4 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6657 + ... + 6760.

2⁶⁹⁷⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

697684 is a deficient number, since it is larger than the sum of its proper divisors (617280).

697684 is a wasteful number, since it uses less digits than its factorization.

697684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13434 (or 13432 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 697684 is about 835.2748050791. The cubic root of 697684 is about 88.6923688530.

The spelling of 697684 in words is "six hundred ninety-seven thousand, six hundred eighty-four".