253639 has 2 divisors, whose sum is σ = 253640. Its totient is φ = 253638.

The previous prime is 253637. The next prime is 253651. The reversal of 253639 is 936352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 253639 - 2¹ = 253637 is a prime.

Together with 253637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (253633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126819 + 126820.

It is an arithmetic number, because the mean of its divisors is an integer number (126820).

2²⁵³⁶³⁹ is an apocalyptic number.

253639 is a deficient number, since it is larger than the sum of its proper divisors (1).

253639 is an equidigital number, since it uses as much as digits as its factorization.

253639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 28.

The square root of 253639 is about 503.6258531887. The cubic root of 253639 is about 63.3002381722.

The spelling of 253639 in words is "two hundred fifty-three thousand, six hundred thirty-nine".