624439 has 4 divisors (see below), whose sum is σ = 626080. Its totient is φ = 622800.

The previous prime is 624419. The next prime is 624443. The reversal of 624439 is 934426.

624439 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934426 = 2 ⋅467213.

It is a cyclic number.

It is not a de Polignac number, because 624439 - 2⁷ = 624311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (624419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82 + ... + 1120.

It is an arithmetic number, because the mean of its divisors is an integer number (156520).

2⁶²⁴⁴³⁹ is an apocalyptic number.

624439 is a deficient number, since it is larger than the sum of its proper divisors (1641).

624439 is a wasteful number, since it uses less digits than its factorization.

624439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its digits is 5184, while the sum is 28.

The square root of 624439 is about 790.2145278341. The cubic root of 624439 is about 85.4732084359.

The spelling of 624439 in words is "six hundred twenty-four thousand, four hundred thirty-nine".