252985639 has 2 divisors, whose sum is σ = 252985640. Its totient is φ = 252985638.

The previous prime is 252985633. The next prime is 252985657. The reversal of 252985639 is 936589252.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 252985639 - 2⁷ = 252985511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 252985592 and 252985601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252985633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126492819 + 126492820.

It is an arithmetic number, because the mean of its divisors is an integer number (126492820).

Almost surely, 2^252985639 is an apocalyptic number.

252985639 is a deficient number, since it is larger than the sum of its proper divisors (1).

252985639 is an equidigital number, since it uses as much as digits as its factorization.

252985639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 49.

The square root of 252985639 is about 15905.5222800133. The cubic root of 252985639 is about 632.4583871762.

The spelling of 252985639 in words is "two hundred fifty-two million, nine hundred eighty-five thousand, six hundred thirty-nine".