78930239 has 4 divisors (see below), whose sum is σ = 79696656. Its totient is φ = 78163824.

The previous prime is 78930233. The next prime is 78930253. The reversal of 78930239 is 93203987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93203987 = 19 ⋅4905473.

It is a cyclic number.

It is not a de Polignac number, because 78930239 - 2²⁰ = 77881663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78930196 and 78930205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78930233) 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, 383054 + ... + 383259.

It is an arithmetic number, because the mean of its divisors is an integer number (19924164).

Almost surely, 2^78930239 is an apocalyptic number.

78930239 is a deficient number, since it is larger than the sum of its proper divisors (766417).

78930239 is a wasteful number, since it uses less digits than its factorization.

78930239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766416.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 78930239 is about 8884.2691877273. The cubic root of 78930239 is about 428.9577045292.

The spelling of 78930239 in words is "seventy-eight million, nine hundred thirty thousand, two hundred thirty-nine".