2156686 has 24 divisors (see below), whose sum is σ = 3837240. Its totient is φ = 906192.

The previous prime is 2156683. The next prime is 2156699. The reversal of 2156686 is 6866512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156681) 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, 5596 + ... + 5968.

It is an arithmetic number, because the mean of its divisors is an integer number (159885).

2^2156686 is an apocalyptic number.

2156686 is a deficient number, since it is larger than the sum of its proper divisors (1680554).

2156686 is a wasteful number, since it uses less digits than its factorization.

2156686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 441 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 2156686 is about 1468.5659671938. The cubic root of 2156686 is about 129.1999383361.

The spelling of 2156686 in words is "two million, one hundred fifty-six thousand, six hundred eighty-six".