990390 has 16 divisors (see below), whose sum is σ = 2377008. Its totient is φ = 264096.

The previous prime is 990389. The next prime is 990397. The reversal of 990390 is 93099.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 33013 = 990390 / (9 + 9 + 0 + 3 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16477 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (148563).

2⁹⁹⁰³⁹⁰ is an apocalyptic number.

990390 is an abundant number, since it is smaller than the sum of its proper divisors (1386618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990390 is a wasteful number, since it uses less digits than its factorization.

990390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33023.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 990390 is about 995.1834001831. The cubic root of 990390 is about 99.6786350185.

The spelling of 990390 in words is "nine hundred ninety thousand, three hundred ninety".