11989999 has 8 divisors (see below), whose sum is σ = 14037408. Its totient is φ = 10026240.

The previous prime is 11989997. The next prime is 11990009. The reversal of 11989999 is 99998911.

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

It is not a de Polignac number, because 11989999 - 2¹ = 11989997 is a prime.

11989999 is a modest number, since divided by 9999 gives 1198 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20602 + ... + 21175.

It is an arithmetic number, because the mean of its divisors is an integer number (1754676).

Almost surely, 2^11989999 is an apocalyptic number.

11989999 is a deficient number, since it is larger than the sum of its proper divisors (2047409).

11989999 is an equidigital number, since it uses as much as digits as its factorization.

11989999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41825.

The product of its digits is 472392, while the sum is 55.

The square root of 11989999 is about 3462.6577942384. The cubic root of 11989999 is about 228.8792292384.

The spelling of 11989999 in words is "eleven million, nine hundred eighty-nine thousand, nine hundred ninety-nine".