99078839 has 4 divisors (see below), whose sum is σ = 104907024. Its totient is φ = 93250656.

The previous prime is 99078809. The next prime is 99078841. The reversal of 99078839 is 93887099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93887099 = 157 ⋅598007.

It is a cyclic number.

It is not a de Polignac number, because 99078839 - 2¹⁶ = 99013303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99078809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2914067 + ... + 2914100.

It is an arithmetic number, because the mean of its divisors is an integer number (26226756).

Almost surely, 2^99078839 is an apocalyptic number.

99078839 is a deficient number, since it is larger than the sum of its proper divisors (5828185).

99078839 is a wasteful number, since it uses less digits than its factorization.

99078839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5828184.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 99078839 is about 9953.8353914459. The cubic root of 99078839 is about 462.7292677763.

The spelling of 99078839 in words is "ninety-nine million, seventy-eight thousand, eight hundred thirty-nine".