78939406 has 32 divisors (see below), whose sum is σ = 147184128. Its totient is φ = 30918240.

The previous prime is 78939403. The next prime is 78939431. The reversal of 78939406 is 60493987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78939401) 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 15 ways as a sum of consecutive naturals, for example, 16641 + ... + 20851.

It is an arithmetic number, because the mean of its divisors is an integer number (4599504).

Almost surely, 2^78939406 is an apocalyptic number.

78939406 is a deficient number, since it is larger than the sum of its proper divisors (68244722).

78939406 is a wasteful number, since it uses less digits than its factorization.

78939406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4336.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 78939406 is about 8884.7850846264. The cubic root of 78939406 is about 428.9743103451.

The spelling of 78939406 in words is "seventy-eight million, nine hundred thirty-nine thousand, four hundred six".