85997399 has 2 divisors, whose sum is σ = 85997400. Its totient is φ = 85997398.

The previous prime is 85997393. The next prime is 85997423. The reversal of 85997399 is 99379958.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85997399 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85997393) 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, 42998699 + 42998700.

It is an arithmetic number, because the mean of its divisors is an integer number (42998700).

Almost surely, 2^85997399 is an apocalyptic number.

85997399 is a deficient number, since it is larger than the sum of its proper divisors (1).

85997399 is an equidigital number, since it uses as much as digits as its factorization.

85997399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5511240, while the sum is 59.

The square root of 85997399 is about 9273.4782579138. The cubic root of 85997399 is about 441.3960462664.

The spelling of 85997399 in words is "eighty-five million, nine hundred ninety-seven thousand, three hundred ninety-nine".