990797 has 2 divisors, whose sum is σ = 990798. Its totient is φ = 990796.

The previous prime is 990767. The next prime is 990799. The reversal of 990797 is 797099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556516 + 434281 = 746^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 990797 - 2⁶ = 990733 is a prime.

Together with 990799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495398 + 495399.

It is an arithmetic number, because the mean of its divisors is an integer number (495399).

2⁹⁹⁰⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

990797 is a deficient number, since it is larger than the sum of its proper divisors (1).

990797 is an equidigital number, since it uses as much as digits as its factorization.

990797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 990797 is about 995.3878641012. The cubic root of 990797 is about 99.6922874343.

The spelling of 990797 in words is "nine hundred ninety thousand, seven hundred ninety-seven".