999999263 has 8 divisors (see below), whose sum is σ = 1013654256. Its totient is φ = 986428800.

The previous prime is 999999229. The next prime is 999999323. The reversal of 999999263 is 362999999.

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 999999263 - 2²² = 995804959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999999263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2873 + ... + 44813.

It is an arithmetic number, because the mean of its divisors is an integer number (126706782).

Almost surely, 2^999999263 is an apocalyptic number.

999999263 is a deficient number, since it is larger than the sum of its proper divisors (13654993).

999999263 is a wasteful number, since it uses less digits than its factorization.

999999263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42265.

The product of its digits is 19131876, while the sum is 65.

The square root of 999999263 is about 31622.7649486885. The cubic root of 999999263 is about 999.9997543333. Note that the first 3 decimals are identical.

The spelling of 999999263 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred sixty-three".