624809 has 2 divisors, whose sum is σ = 624810. Its totient is φ = 624808.

The previous prime is 624803. The next prime is 624829. The reversal of 624809 is 908426.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 162409 = 680^2 + 403^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-624809 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 624809.

It is not a weakly prime, because it can be changed into another prime (624803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312404 + 312405.

It is an arithmetic number, because the mean of its divisors is an integer number (312405).

2⁶²⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

624809 is a deficient number, since it is larger than the sum of its proper divisors (1).

624809 is an equidigital number, since it uses as much as digits as its factorization.

624809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 624809 is about 790.4486068050. The cubic root of 624809 is about 85.4900869690.

The spelling of 624809 in words is "six hundred twenty-four thousand, eight hundred nine".