11388649 has 4 divisors (see below), whose sum is σ = 11429460. Its totient is φ = 11347840.

The previous prime is 11388631. The next prime is 11388661. The reversal of 11388649 is 94688311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94688311 = 41 ⋅2309471.

It can be written as a sum of positive squares in 2 ways, for example, as 9517225 + 1871424 = 3085^2 + 1368^2 .

It is a cyclic number.

It is not a de Polignac number, because 11388649 - 2⁹ = 11388137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11388449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19984 + ... + 20545.

It is an arithmetic number, because the mean of its divisors is an integer number (2857365).

Almost surely, 2^11388649 is an apocalyptic number.

It is an amenable number.

11388649 is a deficient number, since it is larger than the sum of its proper divisors (40811).

11388649 is an equidigital number, since it uses as much as digits as its factorization.

11388649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40810.

The product of its digits is 41472, while the sum is 40.

The square root of 11388649 is about 3374.7072465623. The cubic root of 11388649 is about 224.9869885480.

The spelling of 11388649 in words is "eleven million, three hundred eighty-eight thousand, six hundred forty-nine".