697921 has 8 divisors (see below), whose sum is σ = 803520. Its totient is φ = 593808.

The previous prime is 697913. The next prime is 697937. The reversal of 697921 is 129796.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 697921 - 2³ = 697913 is a prime.

It is a Duffinian number.

697921 is a lucky number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (697951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 975 + ... + 1531.

It is an arithmetic number, because the mean of its divisors is an integer number (100440).

2⁶⁹⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

697921 is a deficient number, since it is larger than the sum of its proper divisors (105599).

697921 is a wasteful number, since it uses less digits than its factorization.

697921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its digits is 6804, while the sum is 34.

The square root of 697921 is about 835.4166625104. The cubic root of 697921 is about 88.7024105107.

The spelling of 697921 in words is "six hundred ninety-seven thousand, nine hundred twenty-one".