245849857 has 12 divisors (see below), whose sum is σ = 272920788. Its totient is φ = 221276000.

The previous prime is 245849843. The next prime is 245849887. The reversal of 245849857 is 758948542.

It can be written as a sum of positive squares in 2 ways, for example, as 156150016 + 89699841 = 12496^2 + 9471^2 .

It is a de Polignac number, because none of the positive numbers 2^k-245849857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245849837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2163 + ... + 22279.

It is an arithmetic number, because the mean of its divisors is an integer number (22743399).

Almost surely, 2^245849857 is an apocalyptic number.

It is an amenable number.

245849857 is a deficient number, since it is larger than the sum of its proper divisors (27070931).

245849857 is a wasteful number, since it uses less digits than its factorization.

245849857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20240 (or 20229 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The square root of 245849857 is about 15679.6000267864. The cubic root of 245849857 is about 626.4551540534.

The spelling of 245849857 in words is "two hundred forty-five million, eight hundred forty-nine thousand, eight hundred fifty-seven".