2660857 has 4 divisors (see below), whose sum is σ = 2817396. Its totient is φ = 2504320.

The previous prime is 2660849. The next prime is 2660863. The reversal of 2660857 is 7580662.

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 1692601 + 968256 = 1301^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660857 - 2³ = 2660849 is a prime.

It is a Duffinian number.

2660857 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2660887) 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, 78244 + ... + 78277.

It is an arithmetic number, because the mean of its divisors is an integer number (704349).

2^2660857 is an apocalyptic number.

It is an amenable number.

2660857 is a deficient number, since it is larger than the sum of its proper divisors (156539).

2660857 is a wasteful number, since it uses less digits than its factorization.

2660857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156538.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 2660857 is about 1631.2133520788. The cubic root of 2660857 is about 138.5714767016.

The spelling of 2660857 in words is "two million, six hundred sixty thousand, eight hundred fifty-seven".