11638919 has 4 divisors (see below), whose sum is σ = 12014400. Its totient is φ = 11263440.

The previous prime is 11638903. The next prime is 11638951. The reversal of 11638919 is 91983611.

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

It is a cyclic number.

It is not a de Polignac number, because 11638919 - 2⁴ = 11638903 is a prime.

It is a super-2 number, since 2×11638919² = 270928870977122, 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 (11638819) by changing a digit.

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, 187694 + ... + 187755.

It is an arithmetic number, because the mean of its divisors is an integer number (3003600).

Almost surely, 2^11638919 is an apocalyptic number.

11638919 is a deficient number, since it is larger than the sum of its proper divisors (375481).

11638919 is an equidigital number, since it uses as much as digits as its factorization.

11638919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375480.

The product of its digits is 11664, while the sum is 38.

The square root of 11638919 is about 3411.5859948124. The cubic root of 11638919 is about 226.6231204793.

The spelling of 11638919 in words is "eleven million, six hundred thirty-eight thousand, nine hundred nineteen".