2159857 has 4 divisors (see below), whose sum is σ = 2468416. Its totient is φ = 1851300.

The previous prime is 2159831. The next prime is 2159881. The reversal of 2159857 is 7589512.

2159857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-2159857 is a prime.

It is a d-powerful number, because it can be written as 2² + 1 + 5⁴ + 9⁵ + 8⁷ + 5⁴ + 7⁴ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154269 + ... + 154282.

It is an arithmetic number, because the mean of its divisors is an integer number (617104).

2^2159857 is an apocalyptic number.

2159857 is the 849-th hex number.

It is an amenable number.

2159857 is a deficient number, since it is larger than the sum of its proper divisors (308559).

2159857 is an equidigital number, since it uses as much as digits as its factorization.

2159857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308558.

The product of its digits is 25200, while the sum is 37.

The square root of 2159857 is about 1469.6451952767. The cubic root of 2159857 is about 129.2632287078.

The spelling of 2159857 in words is "two million, one hundred fifty-nine thousand, eight hundred fifty-seven".