11917999 has 8 divisors (see below), whose sum is σ = 12096000. Its totient is φ = 11741592.

The previous prime is 11917993. The next prime is 11918051. The reversal of 11917999 is 99971911.

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 not a de Polignac number, because 11917999 - 2⁵ = 11917967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11917993) 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, 24642 + ... + 25120.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^11917999 is an apocalyptic number.

11917999 is a deficient number, since it is larger than the sum of its proper divisors (178001).

11917999 is a wasteful number, since it uses less digits than its factorization.

11917999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797.

The product of its digits is 45927, while the sum is 46.

The square root of 11917999 is about 3452.2455011195. The cubic root of 11917999 is about 228.4201688417.

The spelling of 11917999 in words is "eleven million, nine hundred seventeen thousand, nine hundred ninety-nine".