11638775 has 6 divisors (see below), whose sum is σ = 14432112. Its totient is φ = 9311000.

The previous prime is 11638769. The next prime is 11638777. The reversal of 11638775 is 57783611.

It is not a de Polignac number, because 11638775 - 2¹⁰ = 11637751 is a prime.

It is a super-2 number, since 2×11638775² = 270922167001250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11638777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 232751 + ... + 232800.

It is an arithmetic number, because the mean of its divisors is an integer number (2405352).

Almost surely, 2^11638775 is an apocalyptic number.

11638775 is a deficient number, since it is larger than the sum of its proper divisors (2793337).

11638775 is an equidigital number, since it uses as much as digits as its factorization.

11638775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465561 (or 465556 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 11638775 is about 3411.5648901934. The cubic root of 11638775 is about 226.6221858603.

The spelling of 11638775 in words is "eleven million, six hundred thirty-eight thousand, seven hundred seventy-five".