252638857 has 2 divisors, whose sum is σ = 252638858. Its totient is φ = 252638856.

The previous prime is 252638833. The next prime is 252638861. The reversal of 252638857 is 758836252.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229704336 + 22934521 = 15156^2 + 4789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252638857 is a prime.

It is not a weakly prime, because it can be changed into another prime (252638357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126319428 + 126319429.

It is an arithmetic number, because the mean of its divisors is an integer number (126319429).

Almost surely, 2^252638857 is an apocalyptic number.

It is an amenable number.

252638857 is a deficient number, since it is larger than the sum of its proper divisors (1).

252638857 is an equidigital number, since it uses as much as digits as its factorization.

252638857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 46.

The square root of 252638857 is about 15894.6172335165. The cubic root of 252638857 is about 632.1692726431.

The spelling of 252638857 in words is "two hundred fifty-two million, six hundred thirty-eight thousand, eight hundred fifty-seven".