78741139 has 2 divisors, whose sum is σ = 78741140. Its totient is φ = 78741138.

The previous prime is 78741109. The next prime is 78741181. The reversal of 78741139 is 93114787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78741139 - 2¹³ = 78732947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78741109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39370569 + 39370570.

It is an arithmetic number, because the mean of its divisors is an integer number (39370570).

Almost surely, 2^78741139 is an apocalyptic number.

78741139 is a deficient number, since it is larger than the sum of its proper divisors (1).

78741139 is an equidigital number, since it uses as much as digits as its factorization.

78741139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 78741139 is about 8873.6203998143. The cubic root of 78741139 is about 428.6148669040.

The spelling of 78741139 in words is "seventy-eight million, seven hundred forty-one thousand, one hundred thirty-nine".