78971407 has 2 divisors, whose sum is σ = 78971408. Its totient is φ = 78971406.

The previous prime is 78971281. The next prime is 78971413. The reversal of 78971407 is 70417987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78971407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78971107) 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, 39485703 + 39485704.

It is an arithmetic number, because the mean of its divisors is an integer number (39485704).

Almost surely, 2^78971407 is an apocalyptic number.

78971407 is a deficient number, since it is larger than the sum of its proper divisors (1).

78971407 is an equidigital number, since it uses as much as digits as its factorization.

78971407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 78971407 is about 8886.5857898295. The cubic root of 78971407 is about 429.0322693671.

The spelling of 78971407 in words is "seventy-eight million, nine hundred seventy-one thousand, four hundred seven".