85840739 has 2 divisors, whose sum is σ = 85840740. Its totient is φ = 85840738.

The previous prime is 85840721. The next prime is 85840751. The reversal of 85840739 is 93704858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85840739 - 2⁸ = 85840483 is a prime.

It is a super-2 number, since 2×85840739² = 14737264944132242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 85840739.

It is not a weakly prime, because it can be changed into another prime (85840709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42920369 + 42920370.

It is an arithmetic number, because the mean of its divisors is an integer number (42920370).

Almost surely, 2^85840739 is an apocalyptic number.

85840739 is a deficient number, since it is larger than the sum of its proper divisors (1).

85840739 is an equidigital number, since it uses as much as digits as its factorization.

85840739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 85840739 is about 9265.0277387604. The cubic root of 85840739 is about 441.1278554560.

The spelling of 85840739 in words is "eighty-five million, eight hundred forty thousand, seven hundred thirty-nine".