990625 has 12 divisors (see below), whose sum is σ = 1242108. Its totient is φ = 790000.

The previous prime is 990599. The next prime is 990631. The reversal of 990625 is 526099.

It can be written as a sum of positive squares in 6 ways, for example, as 966289 + 24336 = 983^2 + 156^2 .

It is not a de Polignac number, because 990625 - 2⁵ = 990593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2967 + ... + 3283.

It is an arithmetic number, because the mean of its divisors is an integer number (103509).

2⁹⁹⁰⁶²⁵ is an apocalyptic number.

It is an amenable number.

990625 is a deficient number, since it is larger than the sum of its proper divisors (251483).

990625 is an frugal number, since it uses more digits than its factorization.

990625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 322 counting only the distinct ones).

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

The square root of 990625 is about 995.3014618697. The cubic root of 990625 is about 99.6865183192.

The spelling of 990625 in words is "nine hundred ninety thousand, six hundred twenty-five".