990365 has 4 divisors (see below), whose sum is σ = 1188444. Its totient is φ = 792288.

The previous prime is 990361. The next prime is 990371. The reversal of 990365 is 563099.

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

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 417316 = 757^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 990365 - 2² = 990361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990365.

It is not an unprimeable number, because it can be changed into a prime (990361) 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, 99032 + ... + 99041.

It is an arithmetic number, because the mean of its divisors is an integer number (297111).

2⁹⁹⁰³⁶⁵ is an apocalyptic number.

It is an amenable number.

990365 is a deficient number, since it is larger than the sum of its proper divisors (198079).

990365 is a wasteful number, since it uses less digits than its factorization.

990365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198078.

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

The square root of 990365 is about 995.1708396049. The cubic root of 990365 is about 99.6777962961.

The spelling of 990365 in words is "nine hundred ninety thousand, three hundred sixty-five".