990043 has 2 divisors, whose sum is σ = 990044. Its totient is φ = 990042.

The previous prime is 990037. The next prime is 990053. The reversal of 990043 is 340099.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990043 is a prime.

It is not a weakly prime, because it can be changed into another prime (990013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495021 + 495022.

It is an arithmetic number, because the mean of its divisors is an integer number (495022).

2⁹⁹⁰⁰⁴³ is an apocalyptic number.

990043 is a deficient number, since it is larger than the sum of its proper divisors (1).

990043 is an equidigital number, since it uses as much as digits as its factorization.

990043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 990043 is about 995.0090451850. The cubic root of 990043 is about 99.6669922896. Note that the first 3 decimals are identical.

The spelling of 990043 in words is "nine hundred ninety thousand, forty-three".