11689999 has 4 divisors (see below), whose sum is σ = 12377664. Its totient is φ = 11002336.

The previous prime is 11689991. The next prime is 11690011. The reversal of 11689999 is 99998611.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11689999 - 2³ = 11689991 is a prime.

It is a Duffinian number.

11689999 is a modest number, since divided by 9999 gives 1168 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11689991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343807 + ... + 343840.

It is an arithmetic number, because the mean of its divisors is an integer number (3094416).

Almost surely, 2^11689999 is an apocalyptic number.

11689999 is a deficient number, since it is larger than the sum of its proper divisors (687665).

11689999 is an equidigital number, since it uses as much as digits as its factorization.

11689999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687664.

The product of its digits is 314928, while the sum is 52.

The square root of 11689999 is about 3419.0640532169. The cubic root of 11689999 is about 226.9541654178.

It can be divided in two parts, 1 and 1689999, that added together give a square (1690000 = 1300²).

The spelling of 11689999 in words is "eleven million, six hundred eighty-nine thousand, nine hundred ninety-nine".