252440857 has 2 divisors, whose sum is σ = 252440858. Its totient is φ = 252440856.

The previous prime is 252440809. The next prime is 252440861. The reversal of 252440857 is 758044252.

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., 191850201 + 60590656 = 13851^2 + 7784^2 .

It is a cyclic number.

It is not a de Polignac number, because 252440857 - 2¹⁵ = 252408089 is a prime.

It is not a weakly prime, because it can be changed into another prime (252440887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126220428 + 126220429.

It is an arithmetic number, because the mean of its divisors is an integer number (126220429).

Almost surely, 2^252440857 is an apocalyptic number.

It is an amenable number.

252440857 is a deficient number, since it is larger than the sum of its proper divisors (1).

252440857 is an equidigital number, since it uses as much as digits as its factorization.

252440857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 89600, while the sum is 37.

The square root of 252440857 is about 15888.3874889807. The cubic root of 252440857 is about 632.0040800156.

The spelling of 252440857 in words is "two hundred fifty-two million, four hundred forty thousand, eight hundred fifty-seven".