2156685 has 8 divisors (see below), whose sum is σ = 3450720. Its totient is φ = 1150224.

The previous prime is 2156683. The next prime is 2156699. The reversal of 2156685 is 5866512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156685 - 2¹ = 2156683 is a prime.

2156685 is a lucky number.

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 7 ways as a sum of consecutive naturals, for example, 71875 + ... + 71904.

It is an arithmetic number, because the mean of its divisors is an integer number (431340).

2^2156685 is an apocalyptic number.

It is an amenable number.

2156685 is a deficient number, since it is larger than the sum of its proper divisors (1294035).

2156685 is a wasteful number, since it uses less digits than its factorization.

2156685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143787.

The product of its digits is 14400, while the sum is 33.

The square root of 2156685 is about 1468.5656267256. The cubic root of 2156685 is about 129.1999183672.

The spelling of 2156685 in words is "two million, one hundred fifty-six thousand, six hundred eighty-five".