11999963 has 4 divisors (see below), whose sum is σ = 12631560. Its totient is φ = 11368368.

The previous prime is 11999941. The next prime is 11999987. The reversal of 11999963 is 36999911.

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 11999963 - 2¹⁸ = 11737819 is a prime.

It is a super-2 number, since 2×11999963² = 287998224002738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11999903) 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, 315770 + ... + 315807.

It is an arithmetic number, because the mean of its divisors is an integer number (3157890).

Almost surely, 2^11999963 is an apocalyptic number.

11999963 is a deficient number, since it is larger than the sum of its proper divisors (631597).

11999963 is an equidigital number, since it uses as much as digits as its factorization.

11999963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631596.

The product of its digits is 118098, while the sum is 47.

The square root of 11999963 is about 3464.0962746436. The cubic root of 11999963 is about 228.9426132081.

The spelling of 11999963 in words is "eleven million, nine hundred ninety-nine thousand, nine hundred sixty-three".