11990209 has 8 divisors (see below), whose sum is σ = 14948928. Its totient is φ = 9342960.

The previous prime is 11990201. The next prime is 11990213. The reversal of 11990209 is 90209911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11990209 - 2³ = 11990201 is a prime.

It is a super-2 number, since 2×11990209² = 287530223727362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77782 + ... + 77935.

It is an arithmetic number, because the mean of its divisors is an integer number (1868616).

Almost surely, 2^11990209 is an apocalyptic number.

It is an amenable number.

11990209 is a deficient number, since it is larger than the sum of its proper divisors (2958719).

11990209 is a wasteful number, since it uses less digits than its factorization.

11990209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155735.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 11990209 is about 3462.6881176335. The cubic root of 11990209 is about 228.8805654731.

The spelling of 11990209 in words is "eleven million, nine hundred ninety thousand, two hundred nine".