690009 has 4 divisors (see below), whose sum is σ = 920016. Its totient is φ = 460004.

The previous prime is 689987. The next prime is 690037. The reversal of 690009 is 900096.

690009 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690009 - 2¹¹ = 687961 is a prime.

It is a super-2 number, since 2×690009² = 952224840162, which contains 22 as substring.

It is a D-number.

690009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (690059) 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, 114999 + ... + 115004.

It is an arithmetic number, because the mean of its divisors is an integer number (230004).

2⁶⁹⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

690009 is a deficient number, since it is larger than the sum of its proper divisors (230007).

690009 is a wasteful number, since it uses less digits than its factorization.

690009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230006.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 690009 is about 830.6678036375. The cubic root of 690009 is about 88.3659434204.

The spelling of 690009 in words is "six hundred ninety thousand, nine".