245939857 has 4 divisors (see below), whose sum is σ = 258884080. Its totient is φ = 232995636.

The previous prime is 245939839. The next prime is 245939887. The reversal of 245939857 is 758939542.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245939857 is a prime.

It is a super-2 number, since 2×245939857² = 120972826522360898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245939887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6472083 + ... + 6472120.

It is an arithmetic number, because the mean of its divisors is an integer number (64721020).

Almost surely, 2^245939857 is an apocalyptic number.

It is an amenable number.

245939857 is a deficient number, since it is larger than the sum of its proper divisors (12944223).

245939857 is a wasteful number, since it uses less digits than its factorization.

245939857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12944222.

The product of its digits is 2721600, while the sum is 52.

The square root of 245939857 is about 15682.4697353446. The cubic root of 245939857 is about 626.5315883536.

The spelling of 245939857 in words is "two hundred forty-five million, nine hundred thirty-nine thousand, eight hundred fifty-seven".