99890389 has 2 divisors, whose sum is σ = 99890390. Its totient is φ = 99890388.

The previous prime is 99890387. The next prime is 99890411. The reversal of 99890389 is 98309899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60326289 + 39564100 = 7767^2 + 6290^2 .

It is a cyclic number.

It is not a de Polignac number, because 99890389 - 2¹ = 99890387 is a prime.

Together with 99890387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99890381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49945194 + 49945195.

It is an arithmetic number, because the mean of its divisors is an integer number (49945195).

Almost surely, 2^99890389 is an apocalyptic number.

It is an amenable number.

99890389 is a deficient number, since it is larger than the sum of its proper divisors (1).

99890389 is an equidigital number, since it uses as much as digits as its factorization.

99890389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 55.

The square root of 99890389 is about 9994.5179473549. The cubic root of 99890389 is about 463.9892316293.

The spelling of 99890389 in words is "ninety-nine million, eight hundred ninety thousand, three hundred eighty-nine".