11809993 has 16 divisors (see below), whose sum is σ = 13389376. Its totient is φ = 10342080.

The previous prime is 11809979. The next prime is 11809999. The reversal of 11809993 is 39990811.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11809993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11809999) 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 15 ways as a sum of consecutive naturals, for example, 20398 + ... + 20968.

It is an arithmetic number, because the mean of its divisors is an integer number (836836).

Almost surely, 2^11809993 is an apocalyptic number.

11809993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11809993 is a deficient number, since it is larger than the sum of its proper divisors (1579383).

11809993 is a wasteful number, since it uses less digits than its factorization.

11809993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 11809993 is about 3436.5670370298. The cubic root of 11809993 is about 227.7280601559.

The spelling of 11809993 in words is "eleven million, eight hundred nine thousand, nine hundred ninety-three".