2161636 has 12 divisors (see below), whose sum is σ = 3794560. Its totient is φ = 1077480.

The previous prime is 2161633. The next prime is 2161637. The reversal of 2161636 is 6361612.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2161636.

It is not an unprimeable number, because it can be changed into a prime (2161633) 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, 1141 + ... + 2371.

2^2161636 is an apocalyptic number.

It is an amenable number.

2161636 is a deficient number, since it is larger than the sum of its proper divisors (1632924).

2161636 is a wasteful number, since it uses less digits than its factorization.

2161636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674 (or 1672 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 2161636 is about 1470.2503188233. The cubic root of 2161636 is about 129.2987088617.

The spelling of 2161636 in words is "two million, one hundred sixty-one thousand, six hundred thirty-six".