990238307 has 2 divisors, whose sum is σ = 990238308. Its totient is φ = 990238306.

The previous prime is 990238303. The next prime is 990238309. The reversal of 990238307 is 703832099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990238307 - 2² = 990238303 is a prime.

Together with 990238309, 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 (990238303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495119153 + 495119154.

It is an arithmetic number, because the mean of its divisors is an integer number (495119154).

Almost surely, 2^990238307 is an apocalyptic number.

990238307 is a deficient number, since it is larger than the sum of its proper divisors (1).

990238307 is an equidigital number, since it uses as much as digits as its factorization.

990238307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 990238307 is about 31468.0521640600. The cubic root of 990238307 is about 996.7354566873.

The spelling of 990238307 in words is "nine hundred ninety million, two hundred thirty-eight thousand, three hundred seven".