990145 has 8 divisors (see below), whose sum is σ = 1279656. Its totient is φ = 731136.

The previous prime is 990137. The next prime is 990151. The reversal of 990145 is 541099.

It can be written as a sum of positive squares in 4 ways, for example, as 4096 + 986049 = 64^2 + 993^2 .

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 990145 - 2³ = 990137 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 7 ways as a sum of consecutive naturals, for example, 7552 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (159957).

2⁹⁹⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

990145 is a deficient number, since it is larger than the sum of its proper divisors (289511).

990145 is a wasteful number, since it uses less digits than its factorization.

990145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15251.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 990145 is about 995.0602996804. The cubic root of 990145 is about 99.6704149302.

The spelling of 990145 in words is "nine hundred ninety thousand, one hundred forty-five".