609990 has 16 divisors (see below), whose sum is σ = 1464048. Its totient is φ = 162656.

The previous prime is 609989. The next prime is 609991. The reversal of 609990 is 99906.

609990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (609989) and next prime (609991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609991) 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, 10137 + ... + 10196.

It is an arithmetic number, because the mean of its divisors is an integer number (91503).

2⁶⁰⁹⁹⁹⁰ is an apocalyptic number.

609990 is an abundant number, since it is smaller than the sum of its proper divisors (854058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

609990 is a wasteful number, since it uses less digits than its factorization.

609990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20343.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 609990 is about 781.0185657204. The cubic root of 609990 is about 84.8087974438.

The spelling of 609990 in words is "six hundred nine thousand, nine hundred ninety".