690017 has 4 divisors (see below), whose sum is σ = 697860. Its totient is φ = 682176.

The previous prime is 689987. The next prime is 690037. The reversal of 690017 is 710096.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 474721 + 215296 = 689^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 690017 - 2⁸ = 689761 is a prime.

It is a super-2 number, since 2×690017² = 952246920578, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 689974 and 690001.

It is not an unprimeable number, because it can be changed into a prime (690037) 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, 3788 + ... + 3965.

It is an arithmetic number, because the mean of its divisors is an integer number (174465).

2⁶⁹⁰⁰¹⁷ is an apocalyptic number.

It is an amenable number.

690017 is a deficient number, since it is larger than the sum of its proper divisors (7843).

690017 is an equidigital number, since it uses as much as digits as its factorization.

690017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7842.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 690017 is about 830.6726190263. The cubic root of 690017 is about 88.3662849256.

The spelling of 690017 in words is "six hundred ninety thousand, seventeen".