990256 has 20 divisors (see below), whose sum is σ = 1953000. Its totient is φ = 486272.

The previous prime is 990239. The next prime is 990259. The reversal of 990256 is 652099.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (990259) by changing a digit.

990256 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2⁹⁹⁰²⁵⁶ is an apocalyptic number.

It is an amenable number.

990256 is a deficient number, since it is larger than the sum of its proper divisors (962744).

990256 is a wasteful number, since it uses less digits than its factorization.

990256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 990256 is about 995.1160736316. The cubic root of 990256 is about 99.6741393014.

The spelling of 990256 in words is "nine hundred ninety thousand, two hundred fifty-six".