424639 has 2 divisors, whose sum is σ = 424640. Its totient is φ = 424638.

The previous prime is 424601. The next prime is 424661. The reversal of 424639 is 936424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-424639 is a prime.

It is equal to p₃₅₇₄₉ and since 424639 and 35749 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212319 + 212320.

It is an arithmetic number, because the mean of its divisors is an integer number (212320).

2⁴²⁴⁶³⁹ is an apocalyptic number.

424639 is a deficient number, since it is larger than the sum of its proper divisors (1).

424639 is an equidigital number, since it uses as much as digits as its factorization.

424639 is an evil number, because the sum of its binary digits is even.

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

The square root of 424639 is about 651.6433073392. The cubic root of 424639 is about 75.1634361821.

The spelling of 424639 in words is "four hundred twenty-four thousand, six hundred thirty-nine".