990397 has 2 divisors, whose sum is σ = 990398. Its totient is φ = 990396.

The previous prime is 990389. The next prime is 990463. The reversal of 990397 is 793099.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894916 + 95481 = 946^2 + 309^2 .

It is an emirp because it is prime and its reverse (793099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990397 - 2³ = 990389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990307) 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, 495198 + 495199.

It is an arithmetic number, because the mean of its divisors is an integer number (495199).

2⁹⁹⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

990397 is a deficient number, since it is larger than the sum of its proper divisors (1).

990397 is an equidigital number, since it uses as much as digits as its factorization.

990397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 37.

The square root of 990397 is about 995.1869171166. The cubic root of 990397 is about 99.6788698582.

It can be divided in two parts, 9903 and 97, that added together give a 4-th power (10000 = 10⁴).

The spelling of 990397 in words is "nine hundred ninety thousand, three hundred ninety-seven".