11813643 has 12 divisors (see below), whose sum is σ = 17652960. Its totient is φ = 7604016.

The previous prime is 11813621. The next prime is 11813653. The reversal of 11813643 is 34631811.

11813643 is a `hidden beast` number, since 1 + 1 + 8 + 13 + 643 = 666.

It is not a de Polignac number, because 11813643 - 2¹² = 11809547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11813653) 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, 22371 + ... + 22892.

It is an arithmetic number, because the mean of its divisors is an integer number (1471080).

Almost surely, 2^11813643 is an apocalyptic number.

11813643 is a deficient number, since it is larger than the sum of its proper divisors (5839317).

11813643 is a wasteful number, since it uses less digits than its factorization.

11813643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45298 (or 45295 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 11813643 is about 3437.0980492270. The cubic root of 11813643 is about 227.7515183071.

The spelling of 11813643 in words is "eleven million, eight hundred thirteen thousand, six hundred forty-three".