999806977 has 8 divisors (see below), whose sum is σ = 1077042176. Its totient is φ = 922618512.

The previous prime is 999806953. The next prime is 999806981. The reversal of 999806977 is 779608999.

999806977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999806977 is a prime.

It is a super-2 number, since 2×999806977² = 1999227982515757058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999806177) 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, 41878 + ... + 61264.

It is an arithmetic number, because the mean of its divisors is an integer number (134630272).

Almost surely, 2^999806977 is an apocalyptic number.

It is an amenable number.

999806977 is a deficient number, since it is larger than the sum of its proper divisors (77235199).

999806977 is a wasteful number, since it uses less digits than its factorization.

999806977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23367.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The square root of 999806977 is about 31619.7244927909. The cubic root of 999806977 is about 999.9356548598.

The spelling of 999806977 in words is "nine hundred ninety-nine million, eight hundred six thousand, nine hundred seventy-seven".