990839387 has 2 divisors, whose sum is σ = 990839388. Its totient is φ = 990839386.

The previous prime is 990839299. The next prime is 990839389. The reversal of 990839387 is 783938099.

990839387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990839387 - 2¹² = 990835291 is a prime.

Together with 990839389, 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 (990839389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495419693 + 495419694.

It is an arithmetic number, because the mean of its divisors is an integer number (495419694).

Almost surely, 2^990839387 is an apocalyptic number.

990839387 is a deficient number, since it is larger than the sum of its proper divisors (1).

990839387 is an equidigital number, since it uses as much as digits as its factorization.

990839387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 990839387 is about 31477.6013539787. The cubic root of 990839387 is about 996.9370904969.

The spelling of 990839387 in words is "nine hundred ninety million, eight hundred thirty-nine thousand, three hundred eighty-seven".