990742427 has 2 divisors, whose sum is σ = 990742428. Its totient is φ = 990742426.

The previous prime is 990742387. The next prime is 990742429. The reversal of 990742427 is 724247099.

It is a strong prime.

It is an emirp because it is prime and its reverse (724247099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990742427 - 2¹⁰ = 990741403 is a prime.

Together with 990742429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (990742429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495371213 + 495371214.

It is an arithmetic number, because the mean of its divisors is an integer number (495371214).

Almost surely, 2^990742427 is an apocalyptic number.

990742427 is a deficient number, since it is larger than the sum of its proper divisors (1).

990742427 is an equidigital number, since it uses as much as digits as its factorization.

990742427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 990742427 is about 31476.0611735331. The cubic root of 990742427 is about 996.9045705362.

The spelling of 990742427 in words is "nine hundred ninety million, seven hundred forty-two thousand, four hundred twenty-seven".