11889909 has 20 divisors (see below), whose sum is σ = 17866860. Its totient is φ = 7879680.

The previous prime is 11889901. The next prime is 11889923. The reversal of 11889909 is 90998811.

It can be written as a sum of positive squares in 2 ways, for example, as 10909809 + 980100 = 3303^2 + 990^2 .

It is not a de Polignac number, because 11889909 - 2³ = 11889901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11889901) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18229 + ... + 18869.

It is an arithmetic number, because the mean of its divisors is an integer number (893343).

Almost surely, 2^11889909 is an apocalyptic number.

It is an amenable number.

11889909 is a deficient number, since it is larger than the sum of its proper divisors (5976951).

11889909 is an equidigital number, since it uses as much as digits as its factorization.

11889909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 11889909 is about 3448.1747345516. The cubic root of 11889909 is about 228.2405701771.

The spelling of 11889909 in words is "eleven million, eight hundred eighty-nine thousand, nine hundred nine".