245857 has 4 divisors (see below), whose sum is σ = 251136. Its totient is φ = 240580.

The previous prime is 245851. The next prime is 245863. The reversal of 245857 is 758542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (245851) and next prime (245863).

It is a cyclic number.

It is not a de Polignac number, because 245857 - 2³ = 245849 is a prime.

It is a Duffinian number.

245857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (245851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2569 + ... + 2662.

It is an arithmetic number, because the mean of its divisors is an integer number (62784).

2²⁴⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

245857 is a deficient number, since it is larger than the sum of its proper divisors (5279).

245857 is an equidigital number, since it uses as much as digits as its factorization.

245857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278.

The product of its digits is 11200, while the sum is 31.

The square root of 245857 is about 495.8396918360. The cubic root of 245857 is about 62.6461221070.

The spelling of 245857 in words is "two hundred forty-five thousand, eight hundred fifty-seven".