689697 has 12 divisors (see below), whose sum is σ = 1003860. Its totient is φ = 456288.

The previous prime is 689693. The next prime is 689699. The reversal of 689697 is 796986.

It can be written as a sum of positive squares in 2 ways, for example, as 467856 + 221841 = 684^2 + 471^2 .

It is not a de Polignac number, because 689697 - 2² = 689693 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (689693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1579 + ... + 1967.

It is an arithmetic number, because the mean of its divisors is an integer number (83655).

2⁶⁸⁹⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

689697 is a deficient number, since it is larger than the sum of its proper divisors (314163).

689697 is a wasteful number, since it uses less digits than its factorization.

689697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 589 counting only the distinct ones).

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

The square root of 689697 is about 830.4799816973. The cubic root of 689697 is about 88.3526226614.

The spelling of 689697 in words is "six hundred eighty-nine thousand, six hundred ninety-seven".