78380039 has 2 divisors, whose sum is σ = 78380040. Its totient is φ = 78380038.

The previous prime is 78380033. The next prime is 78380041. The reversal of 78380039 is 93008387.

It is a strong prime.

It is an emirp because it is prime and its reverse (93008387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78380039 - 2¹² = 78375943 is a prime.

It is a super-2 number, since 2×78380039² = 12286861027283042, which contains 22 as substring.

Together with 78380041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78379984 and 78380011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78380033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190019 + 39190020.

It is an arithmetic number, because the mean of its divisors is an integer number (39190020).

Almost surely, 2^78380039 is an apocalyptic number.

78380039 is a deficient number, since it is larger than the sum of its proper divisors (1).

78380039 is an equidigital number, since it uses as much as digits as its factorization.

78380039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 78380039 is about 8853.2501941377. The cubic root of 78380039 is about 427.9586659795.

The spelling of 78380039 in words is "seventy-eight million, three hundred eighty thousand, thirty-nine".