990499 has 4 divisors (see below), whose sum is σ = 999864. Its totient is φ = 981136.

The previous prime is 990497. The next prime is 990503. The reversal of 990499 is 994099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994099 = 19 ⋅52321.

It is a cyclic number.

It is not a de Polignac number, because 990499 - 2¹ = 990497 is a prime.

It is a Duffinian number.

990499 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (990497) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4522 + ... + 4735.

It is an arithmetic number, because the mean of its divisors is an integer number (249966).

2⁹⁹⁰⁴⁹⁹ is an apocalyptic number.

990499 is a deficient number, since it is larger than the sum of its proper divisors (9365).

990499 is a wasteful number, since it uses less digits than its factorization.

990499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9364.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 990499 is about 995.2381624516. The cubic root of 990499 is about 99.6822916832.

Subtracting 990499 from its reverse (994099), we obtain a square (3600 = 60²).

The spelling of 990499 in words is "nine hundred ninety thousand, four hundred ninety-nine".