78008239 has 2 divisors, whose sum is σ = 78008240. Its totient is φ = 78008238.

The previous prime is 78008179. The next prime is 78008263. The reversal of 78008239 is 93280087.

It is a strong prime.

It is an emirp because it is prime and its reverse (93280087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78008239 - 2²³ = 69619631 is a prime.

It is a super-2 number, since 2×78008239² = 12170570703762242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78008198 and 78008207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78008269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39004119 + 39004120.

It is an arithmetic number, because the mean of its divisors is an integer number (39004120).

Almost surely, 2^78008239 is an apocalyptic number.

78008239 is a deficient number, since it is larger than the sum of its proper divisors (1).

78008239 is an equidigital number, since it uses as much as digits as its factorization.

78008239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 78008239 is about 8832.2272955354. The cubic root of 78008239 is about 427.2809114157.

The spelling of 78008239 in words is "seventy-eight million, eight thousand, two hundred thirty-nine".