990777 has 8 divisors (see below), whose sum is σ = 1398816. Its totient is φ = 621632.

The previous prime is 990767. The next prime is 990797. The reversal of 990777 is 777099.

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 990777 - 2⁴ = 990761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990707) 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, 9663 + ... + 9764.

It is an arithmetic number, because the mean of its divisors is an integer number (174852).

2⁹⁹⁰⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

990777 is a deficient number, since it is larger than the sum of its proper divisors (408039).

990777 is a wasteful number, since it uses less digits than its factorization.

990777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447.

The product of its (nonzero) digits is 27783, while the sum is 39.

The square root of 990777 is about 995.3778177155. The cubic root of 990777 is about 99.6916166413.

The spelling of 990777 in words is "nine hundred ninety thousand, seven hundred seventy-seven".