697979 has 2 divisors, whose sum is σ = 697980. Its totient is φ = 697978.

The previous prime is 697973. The next prime is 697993. The reversal of 697979 is 979796.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697979 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697979.

It is not a weakly prime, because it can be changed into another prime (697973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348989 + 348990.

It is an arithmetic number, because the mean of its divisors is an integer number (348990).

2⁶⁹⁷⁹⁷⁹ is an apocalyptic number.

697979 is a deficient number, since it is larger than the sum of its proper divisors (1).

697979 is an equidigital number, since it uses as much as digits as its factorization.

697979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 47.

The square root of 697979 is about 835.4513750063. The cubic root of 697979 is about 88.7048676166.

The spelling of 697979 in words is "six hundred ninety-seven thousand, nine hundred seventy-nine".