99439 has 2 divisors, whose sum is σ = 99440. Its totient is φ = 99438.

The previous prime is 99431. The next prime is 99469. The reversal of 99439 is 93499.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99439 - 2³ = 99431 is a prime.

It is a super-2 number, since 2×99439² = 19776229442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49719 + 49720.

It is an arithmetic number, because the mean of its divisors is an integer number (49720).

2⁹⁹⁴³⁹ is an apocalyptic number.

99439 is a deficient number, since it is larger than the sum of its proper divisors (1).

99439 is an equidigital number, since it uses as much as digits as its factorization.

99439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748, while the sum is 34.

The square root of 99439 is about 315.3394995873. The cubic root of 99439 is about 46.3289278054.

The spelling of 99439 in words is "ninety-nine thousand, four hundred thirty-nine".