990783 has 12 divisors (see below), whose sum is σ = 1439880. Its totient is φ = 656496.

The previous prime is 990767. The next prime is 990797. The reversal of 990783 is 387099.

It is not a de Polignac number, because 990783 - 2⁴ = 990767 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2353 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (119990).

2⁹⁹⁰⁷⁸³ is an apocalyptic number.

990783 is a deficient number, since it is larger than the sum of its proper divisors (449097).

990783 is a wasteful number, since it uses less digits than its factorization.

990783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 990783 is about 995.3808316418. The cubic root of 990783 is about 99.6918178801.

The spelling of 990783 in words is "nine hundred ninety thousand, seven hundred eighty-three".