697990 has 16 divisors (see below), whose sum is σ = 1266048. Its totient is φ = 277056.

The previous prime is 697979. The next prime is 697993. The reversal of 697990 is 99796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697993) by changing a digit.

697990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (79128).

2⁶⁹⁷⁹⁹⁰ is an apocalyptic number.

697990 is a deficient number, since it is larger than the sum of its proper divisors (568058).

697990 is a wasteful number, since it uses less digits than its factorization.

697990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 697990 is about 835.4579582480. The cubic root of 697990 is about 88.7053336041.

The spelling of 697990 in words is "six hundred ninety-seven thousand, nine hundred ninety".