990890 has 8 divisors (see below), whose sum is σ = 1783620. Its totient is φ = 396352.

The previous prime is 990889. The next prime is 990893. The reversal of 990890 is 98099.

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 12769 = 989^2 + 113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 990890.

It is not an unprimeable number, because it can be changed into a prime (990893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49535 + ... + 49554.

2⁹⁹⁰⁸⁹⁰ is an apocalyptic number.

990890 is a deficient number, since it is larger than the sum of its proper divisors (792730).

990890 is a wasteful number, since it uses less digits than its factorization.

990890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99096.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 990890 is about 995.4345784631. The cubic root of 990890 is about 99.6954065033.

The spelling of 990890 in words is "nine hundred ninety thousand, eight hundred ninety".