85747939 has 2 divisors, whose sum is σ = 85747940. Its totient is φ = 85747938.

The previous prime is 85747901. The next prime is 85747967. The reversal of 85747939 is 93974758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85747939 - 2⁷ = 85747811 is a prime.

It is not a weakly prime, because it can be changed into another prime (85747999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42873969 + 42873970.

It is an arithmetic number, because the mean of its divisors is an integer number (42873970).

Almost surely, 2^85747939 is an apocalyptic number.

85747939 is a deficient number, since it is larger than the sum of its proper divisors (1).

85747939 is an equidigital number, since it uses as much as digits as its factorization.

85747939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 52.

The square root of 85747939 is about 9260.0183045175. The cubic root of 85747939 is about 440.9688345134.

The spelling of 85747939 in words is "eighty-five million, seven hundred forty-seven thousand, nine hundred thirty-nine".