11643749 has 4 divisors (see below), whose sum is σ = 12539436. Its totient is φ = 10748064.

The previous prime is 11643743. The next prime is 11643763. The reversal of 11643749 is 94734611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1288225 + 10355524 = 1135^2 + 3218^2 .

It is a cyclic number.

It is not a de Polignac number, because 11643749 - 2¹⁶ = 11578213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11643743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447824 + ... + 447849.

It is an arithmetic number, because the mean of its divisors is an integer number (3134859).

Almost surely, 2^11643749 is an apocalyptic number.

It is an amenable number.

11643749 is a deficient number, since it is larger than the sum of its proper divisors (895687).

11643749 is an equidigital number, since it uses as much as digits as its factorization.

11643749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895686.

The product of its digits is 18144, while the sum is 35.

The square root of 11643749 is about 3412.2938032942. The cubic root of 11643749 is about 226.6544646930.

It can be divided in two parts, 1164 and 3749, that added together give a cube (4913 = 17³).

The spelling of 11643749 in words is "eleven million, six hundred forty-three thousand, seven hundred forty-nine".