11801999 has 8 divisors (see below), whose sum is σ = 12904320. Its totient is φ = 10704600.

The previous prime is 11801989. The next prime is 11802017. The reversal of 11801999 is 99910811.

It is a happy number.

11801999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 11801999 - 2²⁰ = 10753423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11801939) 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, 5342 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (1613040).

Almost surely, 2^11801999 is an apocalyptic number.

11801999 is a deficient number, since it is larger than the sum of its proper divisors (1102321).

11801999 is a wasteful number, since it uses less digits than its factorization.

11801999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 11801999 is about 3435.4037608409. The cubic root of 11801999 is about 227.6766667014.

The spelling of 11801999 in words is "eleven million, eight hundred one thousand, nine hundred ninety-nine".