99904439 has 2 divisors, whose sum is σ = 99904440.
Its totient is φ = 99904438.
The previous prime is 99904411. The next prime is 99904457. The reversal of 99904439 is 93440999.
It is a happy number.
It is a strong prime.
It is an emirp because it is prime and its reverse (93440999) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 99904439 - 28 = 99904183 is a prime.
It is a Sophie Germain prime.
It is a junction number, because it is equal to n+sod(n) for n = 99904393 and 99904402.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (99904499) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952219 + 49952220.
It is an arithmetic number, because the mean of its divisors is an integer number (49952220).
Almost surely, 299904439 is an apocalyptic number.
99904439 is a deficient number, since it is larger than the sum of its proper divisors (1).
99904439 is an equidigital number, since it uses as much as digits as its factorization.
99904439 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 314928, while the sum is 47.
The square root of 99904439 is about 9995.2208079662.
The cubic root of 99904439 is about 464.0109846166.
The spelling of 99904439 in words is "ninety-nine million, nine hundred four thousand, four hundred thirty-nine".