990389 has 2 divisors, whose sum is σ = 990390. Its totient is φ = 990388.

The previous prime is 990383. The next prime is 990397. The reversal of 990389 is 983099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 20164 = 985^2 + 142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-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 (990383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495194 + 495195.

It is an arithmetic number, because the mean of its divisors is an integer number (495195).

2⁹⁹⁰³⁸⁹ is an apocalyptic number.

It is an amenable number.

990389 is a deficient number, since it is larger than the sum of its proper divisors (1).

990389 is an equidigital number, since it uses as much as digits as its factorization.

990389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 990389 is about 995.1828977630. The cubic root of 990389 is about 99.6786014698.

The spelling of 990389 in words is "nine hundred ninety thousand, three hundred eighty-nine".