78973439 has 2 divisors, whose sum is σ = 78973440. Its totient is φ = 78973438.

The previous prime is 78973379. The next prime is 78973441. The reversal of 78973439 is 93437987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78973439 - 2⁸ = 78973183 is a prime.

It is a super-3 number, since 3×78973439³ (a number of 25 digits) contains 333 as substring.

Together with 78973441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78973469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39486719 + 39486720.

It is an arithmetic number, because the mean of its divisors is an integer number (39486720).

Almost surely, 2^78973439 is an apocalyptic number.

78973439 is a deficient number, since it is larger than the sum of its proper divisors (1).

78973439 is an equidigital number, since it uses as much as digits as its factorization.

78973439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 50.

The square root of 78973439 is about 8886.7001187167. The cubic root of 78973439 is about 429.0359491213.

The spelling of 78973439 in words is "seventy-eight million, nine hundred seventy-three thousand, four hundred thirty-nine".