990635 has 4 divisors (see below), whose sum is σ = 1188768. Its totient is φ = 792504.

The previous prime is 990631. The next prime is 990637. The reversal of 990635 is 536099.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 990635 - 2² = 990631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99059 + ... + 99068.

It is an arithmetic number, because the mean of its divisors is an integer number (297192).

2⁹⁹⁰⁶³⁵ is an apocalyptic number.

990635 is a deficient number, since it is larger than the sum of its proper divisors (198133).

990635 is a wasteful number, since it uses less digits than its factorization.

990635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198132.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 990635 is about 995.3064854606. The cubic root of 990635 is about 99.6868537512.

The spelling of 990635 in words is "nine hundred ninety thousand, six hundred thirty-five".