78939459 has 6 divisors (see below), whose sum is σ = 114023676. Its totient is φ = 52626300.

The previous prime is 78939457. The next prime is 78939481. The reversal of 78939459 is 95493987.

It is not a de Polignac number, because 78939459 - 2¹ = 78939457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78939457) 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 in 5 ways as a sum of consecutive naturals, for example, 4385517 + ... + 4385534.

It is an arithmetic number, because the mean of its divisors is an integer number (19003946).

Almost surely, 2^78939459 is an apocalyptic number.

78939459 is a deficient number, since it is larger than the sum of its proper divisors (35084217).

78939459 is a wasteful number, since it uses less digits than its factorization.

78939459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771057 (or 8771054 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 78939459 is about 8884.7880672529. The cubic root of 78939459 is about 428.9744063496.

The spelling of 78939459 in words is "seventy-eight million, nine hundred thirty-nine thousand, four hundred fifty-nine".