99855839 has 2 divisors, whose sum is σ = 99855840.
Its totient is φ = 99855838.
The previous prime is 99855829. The next prime is 99855851. The reversal of 99855839 is 93855899.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 99855839 - 24 = 99855823 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99855809) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49927919 + 49927920.
It is an arithmetic number, because the mean of its divisors is an integer number (49927920).
Almost surely, 299855839 is an apocalyptic number.
99855839 is a deficient number, since it is larger than the sum of its proper divisors (1).
99855839 is an equidigital number, since it uses as much as digits as its factorization.
99855839 is an evil number, because the sum of its binary digits is even.
The product of its digits is 3499200, while the sum is 56.
The square root of 99855839 is about 9992.7893503266.
The cubic root of 99855839 is about 463.9357307313.
The spelling of 99855839 in words is "ninety-nine million, eight hundred fifty-five thousand, eight hundred thirty-nine".