990002443 has 2 divisors, whose sum is σ = 990002444. Its totient is φ = 990002442.

The previous prime is 990002417. The next prime is 990002471. The reversal of 990002443 is 344200099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990002443 - 2⁹ = 990001931 is a prime.

It is not a weakly prime, because it can be changed into another prime (990002243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495001221 + 495001222.

It is an arithmetic number, because the mean of its divisors is an integer number (495001222).

Almost surely, 2^990002443 is an apocalyptic number.

990002443 is a deficient number, since it is larger than the sum of its proper divisors (1).

990002443 is an equidigital number, since it uses as much as digits as its factorization.

990002443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 990002443 is about 31464.3042668990. The cubic root of 990002443 is about 996.6563132198.

The spelling of 990002443 in words is "nine hundred ninety million, two thousand, four hundred forty-three".