622809 has 24 divisors (see below), whose sum is σ = 1022112. Its totient is φ = 375840.

The previous prime is 622793. The next prime is 622813. The reversal of 622809 is 908226.

It is not a de Polignac number, because 622809 - 2⁴ = 622793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (622849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2557 + ... + 2789.

It is an arithmetic number, because the mean of its divisors is an integer number (42588).

2⁶²²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

622809 is a deficient number, since it is larger than the sum of its proper divisors (399303).

622809 is a wasteful number, since it uses less digits than its factorization.

622809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 622809 is about 789.1824884018. The cubic root of 622809 is about 85.3987721652.

It can be divided in two parts, 622 and 809, that added together give a triangular number (1431 = T₅₃).

The spelling of 622809 in words is "six hundred twenty-two thousand, eight hundred nine".