697409 has 2 divisors, whose sum is σ = 697410. Its totient is φ = 697408.

The previous prime is 697399. The next prime is 697423. The reversal of 697409 is 904796.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 485809 + 211600 = 697^2 + 460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697409 is a prime.

It is an Ulam number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (697009) 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 as a sum of consecutive naturals, namely, 348704 + 348705.

It is an arithmetic number, because the mean of its divisors is an integer number (348705).

2⁶⁹⁷⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

697409 is a deficient number, since it is larger than the sum of its proper divisors (1).

697409 is an equidigital number, since it uses as much as digits as its factorization.

697409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 697409 is about 835.1101723725. The cubic root of 697409 is about 88.6807142899.

The spelling of 697409 in words is "six hundred ninety-seven thousand, four hundred nine".