999788263 has 8 divisors (see below), whose sum is σ = 1005706800. Its totient is φ = 993881280.

The previous prime is 999788261. The next prime is 999788269. The reversal of 999788263 is 362887999.

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 999788263 - 2¹ = 999788261 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 (999788261) 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, 219081 + ... + 223597.

It is an arithmetic number, because the mean of its divisors is an integer number (125713350).

Almost surely, 2^999788263 is an apocalyptic number.

999788263 is a deficient number, since it is larger than the sum of its proper divisors (5918537).

999788263 is a wasteful number, since it uses less digits than its factorization.

999788263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5777.

The product of its digits is 11757312, while the sum is 61.

The square root of 999788263 is about 31619.4285685241. The cubic root of 999788263 is about 999.9294160180.

It can be divided in two parts, 99978 and 8263, that added together give a square (108241 = 329²).

The spelling of 999788263 in words is "nine hundred ninety-nine million, seven hundred eighty-eight thousand, two hundred sixty-three".