999748879 has 4 divisors (see below), whose sum is σ = 1024133040. Its totient is φ = 975364720.

The previous prime is 999748819. The next prime is 999748909. The reversal of 999748879 is 978847999.

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 999748879 - 2¹⁷ = 999617807 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 (999748819) 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 3 ways as a sum of consecutive naturals, for example, 12192019 + ... + 12192100.

It is an arithmetic number, because the mean of its divisors is an integer number (256033260).

Almost surely, 2^999748879 is an apocalyptic number.

999748879 is a deficient number, since it is larger than the sum of its proper divisors (24384161).

999748879 is a wasteful number, since it uses less digits than its factorization.

999748879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24384160.

The product of its digits is 82301184, while the sum is 70.

The square root of 999748879 is about 31618.8057807375. The cubic root of 999748879 is about 999.9162859922.

The spelling of 999748879 in words is "nine hundred ninety-nine million, seven hundred forty-eight thousand, eight hundred seventy-nine".