999977799 has 8 divisors (see below), whose sum is σ = 1369339120. Its totient is φ = 648634176.

The previous prime is 999977773. The next prime is 999977833. The reversal of 999977799 is 997779999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999977799 - 2⁵ = 999977767 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999977799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999977729) 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, 4504294 + ... + 4504515.

It is an arithmetic number, because the mean of its divisors is an integer number (171167390).

Almost surely, 2^999977799 is an apocalyptic number.

999977799 is a deficient number, since it is larger than the sum of its proper divisors (369361321).

999977799 is a wasteful number, since it uses less digits than its factorization.

999977799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9008849.

The product of its digits is 182284263, while the sum is 75.

The square root of 999977799 is about 31622.4255711038. The cubic root of 999977799 is about 999.9925996119.

The spelling of 999977799 in words is "nine hundred ninety-nine million, nine hundred seventy-seven thousand, seven hundred ninety-nine".