2457857 has 4 divisors (see below), whose sum is σ = 2468820. Its totient is φ = 2446896.

The previous prime is 2457839. The next prime is 2457869. The reversal of 2457857 is 7587542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 1201216 = 1121^2 + 1096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2457857 is a prime.

It is a super-2 number, since 2×2457857² = 12082122064898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2457857.

It is not an unprimeable number, because it can be changed into a prime (2457817) 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, 5138 + ... + 5595.

It is an arithmetic number, because the mean of its divisors is an integer number (617205).

2^2457857 is an apocalyptic number.

It is an amenable number.

2457857 is a deficient number, since it is larger than the sum of its proper divisors (10963).

2457857 is a wasteful number, since it uses less digits than its factorization.

2457857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962.

The product of its digits is 78400, while the sum is 38.

The square root of 2457857 is about 1567.7554018405. The cubic root of 2457857 is about 134.9539303250.

The spelling of 2457857 in words is "two million, four hundred fifty-seven thousand, eight hundred fifty-seven".