999963 has 12 divisors (see below), whose sum is σ = 1456728. Its totient is φ = 660960.

The previous prime is 999961. The next prime is 999979. The reversal of 999963 is 369999.

999963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 999963 - 2¹ = 999961 is a prime.

It is an Ulam number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 828 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (121394).

2⁹⁹⁹⁹⁶³ is an apocalyptic number.

999963 is a deficient number, since it is larger than the sum of its proper divisors (456765).

999963 is a wasteful number, since it uses less digits than its factorization.

999963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954 (or 951 counting only the distinct ones).

The product of its digits is 118098, while the sum is 45.

The square root of 999963 is about 999.9814998289. The cubic root of 999963 is about 99.9987666515.

It can be divided in two parts, 99996 and 3, that added together give a palindrome (99999).

The spelling of 999963 in words is "nine hundred ninety-nine thousand, nine hundred sixty-three".