11819999 has 8 divisors (see below), whose sum is σ = 12431232. Its totient is φ = 11216920.

The previous prime is 11819993. The next prime is 11820019. The reversal of 11819999 is 99991811.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11819999 is a prime.

It is a Duffinian number.

11819999 is a modest number, since divided by 9999 gives 1181 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11819993) 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, 1052 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (1553904).

Almost surely, 2^11819999 is an apocalyptic number.

11819999 is a deficient number, since it is larger than the sum of its proper divisors (611233).

11819999 is a wasteful number, since it uses less digits than its factorization.

11819999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077.

The product of its digits is 52488, while the sum is 47.

The square root of 11819999 is about 3438.0225421018. The cubic root of 11819999 is about 227.7923560943.

The spelling of 11819999 in words is "eleven million, eight hundred nineteen thousand, nine hundred ninety-nine".