78783239 has 2 divisors, whose sum is σ = 78783240. Its totient is φ = 78783238.

The previous prime is 78783217. The next prime is 78783241. The reversal of 78783239 is 93238787.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78783239 - 2²⁴ = 62006023 is a prime.

It is a super-2 number, since 2×78783239² = 12413597494662242, which contains 22 as substring.

Together with 78783241, 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 = 78783193 and 78783202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78783209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39391619 + 39391620.

It is an arithmetic number, because the mean of its divisors is an integer number (39391620).

Almost surely, 2^78783239 is an apocalyptic number.

78783239 is a deficient number, since it is larger than the sum of its proper divisors (1).

78783239 is an equidigital number, since it uses as much as digits as its factorization.

78783239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 47.

The square root of 78783239 is about 8875.9922825564. The cubic root of 78783239 is about 428.6912415121.

The spelling of 78783239 in words is "seventy-eight million, seven hundred eighty-three thousand, two hundred thirty-nine".