245657 has 4 divisors (see below), whose sum is σ = 247296. Its totient is φ = 244020.

The previous prime is 245653. The next prime is 245671. The reversal of 245657 is 756542.

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 not a de Polignac number, because 245657 - 2² = 245653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569 + ... + 902.

It is an arithmetic number, because the mean of its divisors is an integer number (61824).

2²⁴⁵⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

245657 is a deficient number, since it is larger than the sum of its proper divisors (1639).

245657 is a wasteful number, since it uses less digits than its factorization.

245657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its digits is 8400, while the sum is 29.

The square root of 245657 is about 495.6379727180. The cubic root of 245657 is about 62.6291303552.

The spelling of 245657 in words is "two hundred forty-five thousand, six hundred fifty-seven".