622409 has 4 divisors (see below), whose sum is σ = 626304. Its totient is φ = 618516.

The previous prime is 622399. The next prime is 622423. The reversal of 622409 is 904226.

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 a de Polignac number, because none of the positive numbers 2^k-622409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (622009) 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, 1697 + ... + 2030.

It is an arithmetic number, because the mean of its divisors is an integer number (156576).

2⁶²²⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

622409 is a deficient number, since it is larger than the sum of its proper divisors (3895).

622409 is a wasteful number, since it uses less digits than its factorization.

622409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 622409 is about 788.9290208884. The cubic root of 622409 is about 85.3804857540.

The spelling of 622409 in words is "six hundred twenty-two thousand, four hundred nine".