697729 has 2 divisors, whose sum is σ = 697730. Its totient is φ = 697728.

The previous prime is 697727. The next prime is 697733. The reversal of 697729 is 927796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 200704 = 705^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 697729 - 2¹ = 697727 is a prime.

Together with 697727, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 697691 and 697700.

It is not a weakly prime, because it can be changed into another prime (697727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348864 + 348865.

It is an arithmetic number, because the mean of its divisors is an integer number (348865).

2⁶⁹⁷⁷²⁹ is an apocalyptic number.

It is an amenable number.

697729 is a deficient number, since it is larger than the sum of its proper divisors (1).

697729 is an equidigital number, since it uses as much as digits as its factorization.

697729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The square root of 697729 is about 835.3017418873. The cubic root of 697729 is about 88.6942756718.

The spelling of 697729 in words is "six hundred ninety-seven thousand, seven hundred twenty-nine".