697689 has 6 divisors (see below), whose sum is σ = 1007786. Its totient is φ = 465120.

The previous prime is 697687. The next prime is 697691. The reversal of 697689 is 986796.

697689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (697687) and next prime (697691).

It can be written as a sum of positive squares in only one way, i.e., 455625 + 242064 = 675^2 + 492^2 .

It is not a de Polignac number, because 697689 - 2¹ = 697687 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697689.

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 5 ways as a sum of consecutive naturals, for example, 38752 + ... + 38769.

2⁶⁹⁷⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

697689 is a deficient number, since it is larger than the sum of its proper divisors (310097).

697689 is a wasteful number, since it uses less digits than its factorization.

697689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77527 (or 77524 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 697689 is about 835.2777981007. The cubic root of 697689 is about 88.6925807258.

The spelling of 697689 in words is "six hundred ninety-seven thousand, six hundred eighty-nine".