2136857 has 4 divisors (see below), whose sum is σ = 2158116. Its totient is φ = 2115600.

The previous prime is 2136853. The next prime is 2136863. The reversal of 2136857 is 7586312.

It is a happy number.

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 1032256 + 1104601 = 1016^2 + 1051^2 .

It is a cyclic number.

It is not a de Polignac number, because 2136857 - 2² = 2136853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2136853) 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, 10478 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (539529).

2^2136857 is an apocalyptic number.

It is an amenable number.

2136857 is a deficient number, since it is larger than the sum of its proper divisors (21259).

2136857 is a wasteful number, since it uses less digits than its factorization.

2136857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21258.

The product of its digits is 10080, while the sum is 32.

The square root of 2136857 is about 1461.7992338211. The cubic root of 2136857 is about 128.8027552681.

The spelling of 2136857 in words is "two million, one hundred thirty-six thousand, eight hundred fifty-seven".