999000977 has 4 divisors (see below), whose sum is σ = 1075847220. Its totient is φ = 922154736.

The previous prime is 999000967. The next prime is 999000991. The reversal of 999000977 is 779000999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 779000999 = 7 ⋅111285857.

It can be written as a sum of positive squares in 2 ways, for example, as 180526096 + 818474881 = 13436^2 + 28609^2 .

It is a cyclic number.

It is not a de Polignac number, because 999000977 - 2¹⁸ = 998738833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999000967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38423102 + ... + 38423127.

It is an arithmetic number, because the mean of its divisors is an integer number (268961805).

Almost surely, 2^999000977 is an apocalyptic number.

It is an amenable number.

999000977 is a deficient number, since it is larger than the sum of its proper divisors (76846243).

999000977 is a wasteful number, since it uses less digits than its factorization.

999000977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76846242.

The product of its (nonzero) digits is 321489, while the sum is 50.

The square root of 999000977 is about 31606.9767140105. The cubic root of 999000977 is about 999.6668813776. Note that the first 3 decimals are identical.

The spelling of 999000977 in words is "nine hundred ninety-nine million, nine hundred seventy-seven", and thus it is an aban number.