11638855 has 4 divisors (see below), whose sum is σ = 13966632. Its totient is φ = 9311080.

The previous prime is 11638819. The next prime is 11638873. The reversal of 11638855 is 55883611.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-11638855 is a prime.

It is a super-2 number, since 2×11638855² = 270925891422050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1163881 + ... + 1163890.

It is an arithmetic number, because the mean of its divisors is an integer number (3491658).

Almost surely, 2^11638855 is an apocalyptic number.

11638855 is a deficient number, since it is larger than the sum of its proper divisors (2327777).

11638855 is an equidigital number, since it uses as much as digits as its factorization.

11638855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327776.

The product of its digits is 28800, while the sum is 37.

The square root of 11638855 is about 3411.5766149978. The cubic root of 11638855 is about 226.6227050940.

The spelling of 11638855 in words is "eleven million, six hundred thirty-eight thousand, eight hundred fifty-five".