690609 has 4 divisors (see below), whose sum is σ = 920816. Its totient is φ = 460404.

The previous prime is 690607. The next prime is 690611. The reversal of 690609 is 906096.

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 an interprime number because it is at equal distance from previous prime (690607) and next prime (690611).

It is not a de Polignac number, because 690609 - 2¹ = 690607 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690607) 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, 115099 + ... + 115104.

It is an arithmetic number, because the mean of its divisors is an integer number (230204).

2⁶⁹⁰⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

690609 is a deficient number, since it is larger than the sum of its proper divisors (230207).

690609 is a wasteful number, since it uses less digits than its factorization.

690609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230206.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 690609 is about 831.0288803646. The cubic root of 690609 is about 88.3915489829.

The spelling of 690609 in words is "six hundred ninety thousand, six hundred nine".