11909867 has 4 divisors (see below), whose sum is σ = 11943960. Its totient is φ = 11875776.

The previous prime is 11909851. The next prime is 11909869. The reversal of 11909867 is 76890911.

It is a happy number.

11909867 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 76890911 = 3019 ⋅25469.

It is a cyclic number.

It is not a de Polignac number, because 11909867 - 2⁴ = 11909851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11909869) 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, 16517 + ... + 17222.

It is an arithmetic number, because the mean of its divisors is an integer number (2985990).

Almost surely, 2^11909867 is an apocalyptic number.

11909867 is a deficient number, since it is larger than the sum of its proper divisors (34093).

11909867 is an equidigital number, since it uses as much as digits as its factorization.

11909867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34092.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 11909867 is about 3451.0675160014. The cubic root of 11909867 is about 228.3682044291.

The spelling of 11909867 in words is "eleven million, nine hundred nine thousand, eight hundred sixty-seven".