990839393 has 2 divisors, whose sum is σ = 990839394. Its totient is φ = 990839392.

The previous prime is 990839389. The next prime is 990839401. The reversal of 990839393 is 393938099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652904704 + 337934689 = 25552^2 + 18383^2 .

It is a cyclic number.

It is not a de Polignac number, because 990839393 - 2² = 990839389 is a prime.

It is not a weakly prime, because it can be changed into another prime (990839693) 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, 495419696 + 495419697.

It is an arithmetic number, because the mean of its divisors is an integer number (495419697).

Almost surely, 2^990839393 is an apocalyptic number.

It is an amenable number.

990839393 is a deficient number, since it is larger than the sum of its proper divisors (1).

990839393 is an equidigital number, since it uses as much as digits as its factorization.

990839393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 53.

The square root of 990839393 is about 31477.6014492845. The cubic root of 990839393 is about 996.9370925092.

The spelling of 990839393 in words is "nine hundred ninety million, eight hundred thirty-nine thousand, three hundred ninety-three".