11999663 has 4 divisors (see below), whose sum is σ = 12922728. Its totient is φ = 11076600.

The previous prime is 11999657. The next prime is 11999681. The reversal of 11999663 is 36699911.

It is a happy number.

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 11999663 - 2¹² = 11995567 is a prime.

It is a super-2 number, since 2×11999663² = 287983824227138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11999653) 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, 461513 + ... + 461538.

It is an arithmetic number, because the mean of its divisors is an integer number (3230682).

Almost surely, 2^11999663 is an apocalyptic number.

11999663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11999663 is a deficient number, since it is larger than the sum of its proper divisors (923065).

11999663 is an equidigital number, since it uses as much as digits as its factorization.

11999663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923064.

The product of its digits is 78732, while the sum is 44.

The square root of 11999663 is about 3464.0529730361. The cubic root of 11999663 is about 228.9407053312.

The spelling of 11999663 in words is "eleven million, nine hundred ninety-nine thousand, six hundred sixty-three".