78085739 has 2 divisors, whose sum is σ = 78085740. Its totient is φ = 78085738.

The previous prime is 78085727. The next prime is 78085751. The reversal of 78085739 is 93758087.

It is a balanced prime because it is at equal distance from previous prime (78085727) and next prime (78085751).

It is an emirp because it is prime and its reverse (93758087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78085739 - 2⁴ = 78085723 is a prime.

It is a super-2 number, since 2×78085739² = 12194765270352242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78085693 and 78085702.

It is not a weakly prime, because it can be changed into another prime (78085789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39042869 + 39042870.

It is an arithmetic number, because the mean of its divisors is an integer number (39042870).

Almost surely, 2^78085739 is an apocalyptic number.

78085739 is a deficient number, since it is larger than the sum of its proper divisors (1).

78085739 is an equidigital number, since it uses as much as digits as its factorization.

78085739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 78085739 is about 8836.6135481869. The cubic root of 78085739 is about 427.4223636133.

The spelling of 78085739 in words is "seventy-eight million, eighty-five thousand, seven hundred thirty-nine".