990655 has 8 divisors (see below), whose sum is σ = 1195200. Its totient is φ = 788256.

The previous prime is 990643. The next prime is 990673. The reversal of 990655 is 556099.

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 990655 - 2¹¹ = 988607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781 + ... + 1609.

It is an arithmetic number, because the mean of its divisors is an integer number (149400).

2⁹⁹⁰⁶⁵⁵ is an apocalyptic number.

990655 is a deficient number, since it is larger than the sum of its proper divisors (204545).

990655 is a wasteful number, since it uses less digits than its factorization.

990655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 990655 is about 995.3165325664. The cubic root of 990655 is about 99.6875246083.

The spelling of 990655 in words is "nine hundred ninety thousand, six hundred fifty-five".