2149857 has 12 divisors (see below), whose sum is σ = 3212820. Its totient is φ = 1383648.

The previous prime is 2149853. The next prime is 2149859. The reversal of 2149857 is 7589412.

It can be written as a sum of positive squares in 2 ways, for example, as 1245456 + 904401 = 1116^2 + 951^2 .

It is not a de Polignac number, because 2149857 - 2² = 2149853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2149853) 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, 3858 + ... + 4379.

It is an arithmetic number, because the mean of its divisors is an integer number (267735).

2^2149857 is an apocalyptic number.

It is an amenable number.

2149857 is a deficient number, since it is larger than the sum of its proper divisors (1062963).

2149857 is a wasteful number, since it uses less digits than its factorization.

2149857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272 (or 8269 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2149857 is about 1466.2390664554. The cubic root of 2149857 is about 129.0634265343.

The spelling of 2149857 in words is "two million, one hundred forty-nine thousand, eight hundred fifty-seven".