697391 has 4 divisors (see below), whose sum is σ = 738432. Its totient is φ = 656352.

The previous prime is 697387. The next prime is 697397. The reversal of 697391 is 193796.

697391 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 is a cyclic number.

It is not a de Polignac number, because 697391 - 2² = 697387 is a prime.

It is a Duffinian number.

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 697391.

It is not an unprimeable number, because it can be changed into a prime (697397) 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, 20495 + ... + 20528.

It is an arithmetic number, because the mean of its divisors is an integer number (184608).

2⁶⁹⁷³⁹¹ is an apocalyptic number.

697391 is a deficient number, since it is larger than the sum of its proper divisors (41041).

697391 is a wasteful number, since it uses less digits than its factorization.

697391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41040.

The product of its digits is 10206, while the sum is 35.

The square root of 697391 is about 835.0993952818. The cubic root of 697391 is about 88.6799513389.

The spelling of 697391 in words is "six hundred ninety-seven thousand, three hundred ninety-one".