99990389 has 2 divisors, whose sum is σ = 99990390. Its totient is φ = 99990388.

The previous prime is 99990337. The next prime is 99990419. The reversal of 99990389 is 98309999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97911025 + 2079364 = 9895^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 99990389 - 2²⁰ = 98941813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99990329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995194 + 49995195.

It is an arithmetic number, because the mean of its divisors is an integer number (49995195).

Almost surely, 2^99990389 is an apocalyptic number.

It is an amenable number.

99990389 is a deficient number, since it is larger than the sum of its proper divisors (1).

99990389 is an equidigital number, since it uses as much as digits as its factorization.

99990389 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 56.

The square root of 99990389 is about 9999.5194384530. The cubic root of 99990389 is about 464.1440127814.

The spelling of 99990389 in words is "ninety-nine million, nine hundred ninety thousand, three hundred eighty-nine".