697685 has 4 divisors (see below), whose sum is σ = 837228. Its totient is φ = 558144.

The previous prime is 697681. The next prime is 697687. The reversal of 697685 is 586796.

It is a happy number.

697685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391876 + 305809 = 626^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 697685 - 2² = 697681 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4 and base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697685.

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, 69764 + ... + 69773.

It is an arithmetic number, because the mean of its divisors is an integer number (209307).

2⁶⁹⁷⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

697685 is a deficient number, since it is larger than the sum of its proper divisors (139543).

697685 is a wasteful number, since it uses less digits than its factorization.

697685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139542.

The product of its digits is 90720, while the sum is 41.

The square root of 697685 is about 835.2754036843. The cubic root of 697685 is about 88.6924112277.

Subtracting from 697685 its reverse (586796), we obtain a square (110889 = 333²).

The spelling of 697685 in words is "six hundred ninety-seven thousand, six hundred eighty-five".