2161686 has 16 divisors (see below), whose sum is σ = 4577904. Its totient is φ = 678144.

The previous prime is 2161639. The next prime is 2161697. The reversal of 2161686 is 6861612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10495 + ... + 10698.

It is an arithmetic number, because the mean of its divisors is an integer number (286119).

2^2161686 is an apocalyptic number.

2161686 is an abundant number, since it is smaller than the sum of its proper divisors (2416218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161686 is a wasteful number, since it uses less digits than its factorization.

2161686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21215.

The product of its digits is 3456, while the sum is 30.

The square root of 2161686 is about 1470.2673226322. The cubic root of 2161686 is about 129.2997057742.

The spelling of 2161686 in words is "two million, one hundred sixty-one thousand, six hundred eighty-six".