11929909 has 4 divisors (see below), whose sum is σ = 11991916. Its totient is φ = 11867904.

The previous prime is 11929889. The next prime is 11929913. The reversal of 11929909 is 90992911.

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 6275025 + 5654884 = 2505^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 11929909 - 2⁷ = 11929781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11929919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30714 + ... + 31099.

It is an arithmetic number, because the mean of its divisors is an integer number (2997979).

Almost surely, 2^11929909 is an apocalyptic number.

It is an amenable number.

11929909 is a deficient number, since it is larger than the sum of its proper divisors (62007).

11929909 is an equidigital number, since it uses as much as digits as its factorization.

11929909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62006.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 11929909 is about 3453.9700346123. The cubic root of 11929909 is about 228.4962324631.

The spelling of 11929909 in words is "eleven million, nine hundred twenty-nine thousand, nine hundred nine".