2123636 has 24 divisors (see below), whose sum is σ = 3979584. Its totient is φ = 989120.

The previous prime is 2123617. The next prime is 2123663. The reversal of 2123636 is 6363212.

It is a Harshad number since it is a multiple of its sum of digits (23).

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

2123636 is a modest number, since divided by 3636 gives 212 as remainder.

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, 3491 + ... + 4053.

It is an arithmetic number, because the mean of its divisors is an integer number (165816).

2^2123636 is an apocalyptic number.

It is an amenable number.

2123636 is a deficient number, since it is larger than the sum of its proper divisors (1855948).

2123636 is a wasteful number, since it uses less digits than its factorization.

2123636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 629 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

The square root of 2123636 is about 1457.2700504711. The cubic root of 2123636 is about 128.5365659740.

Adding to 2123636 its reverse (6363212), we get a palindrome (8486848).

The spelling of 2123636 in words is "two million, one hundred twenty-three thousand, six hundred thirty-six".