11986989 has 16 divisors (see below), whose sum is σ = 19340928. Its totient is φ = 6446592.

The previous prime is 11986973. The next prime is 11986991. The reversal of 11986989 is 98968911.

It is a happy number.

It is not a de Polignac number, because 11986989 - 2⁴ = 11986973 is a prime.

It is a super-2 number, since 2×11986989² = 287375810572242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11986999) 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 15 ways as a sum of consecutive naturals, for example, 16432 + ... + 17145.

It is an arithmetic number, because the mean of its divisors is an integer number (1208808).

Almost surely, 2^11986989 is an apocalyptic number.

It is an amenable number.

11986989 is a deficient number, since it is larger than the sum of its proper divisors (7353939).

11986989 is a wasteful number, since it uses less digits than its factorization.

11986989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33604.

The product of its digits is 279936, while the sum is 51.

The square root of 11986989 is about 3462.2231297246. The cubic root of 11986989 is about 228.8600748265.

The spelling of 11986989 in words is "eleven million, nine hundred eighty-six thousand, nine hundred eighty-nine".