11638969 has 4 divisors (see below), whose sum is σ = 11673844. Its totient is φ = 11604096.

The previous prime is 11638961. The next prime is 11638973. The reversal of 11638969 is 96983611.

11638969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2518569 + 9120400 = 1587^2 + 3020^2 .

It is a cyclic number.

It is not a de Polignac number, because 11638969 - 2³ = 11638961 is a prime.

It is a super-2 number, since 2×11638969² = 270931198765922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11638961) 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, 16932 + ... + 17605.

It is an arithmetic number, because the mean of its divisors is an integer number (2918461).

Almost surely, 2^11638969 is an apocalyptic number.

It is an amenable number.

11638969 is a deficient number, since it is larger than the sum of its proper divisors (34875).

11638969 is an equidigital number, since it uses as much as digits as its factorization.

11638969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34874.

The product of its digits is 69984, while the sum is 43.

The square root of 11638969 is about 3411.5933227746. The cubic root of 11638969 is about 226.6234449980.

The spelling of 11638969 in words is "eleven million, six hundred thirty-eight thousand, nine hundred sixty-nine".