11638923 has 4 divisors (see below), whose sum is σ = 15518568. Its totient is φ = 7759280.

The previous prime is 11638903. The next prime is 11638951. The reversal of 11638923 is 32983611.

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 11638923 - 2⁹ = 11638411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11638903) 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, 1939818 + ... + 1939823.

It is an arithmetic number, because the mean of its divisors is an integer number (3879642).

Almost surely, 2^11638923 is an apocalyptic number.

11638923 is a deficient number, since it is larger than the sum of its proper divisors (3879645).

11638923 is an equidigital number, since it uses as much as digits as its factorization.

11638923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879644.

The product of its digits is 7776, while the sum is 33.

The square root of 11638923 is about 3411.5865810499. The cubic root of 11638923 is about 226.6231464408.

It can be divided in two parts, 11638 and 923, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 11638923 in words is "eleven million, six hundred thirty-eight thousand, nine hundred twenty-three".