85709399 has 4 divisors (see below), whose sum is σ = 90220440. Its totient is φ = 81198360.

The previous prime is 85709387. The next prime is 85709411. The reversal of 85709399 is 99390758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99390758 = 2 ⋅49695379.

It is an interprime number because it is at equal distance from previous prime (85709387) and next prime (85709411).

It is a cyclic number.

It is not a de Polignac number, because 85709399 - 2²⁴ = 68932183 is a prime.

It is a super-2 number, since 2×85709399² = 14692202153882402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85709329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255492 + ... + 2255529.

It is an arithmetic number, because the mean of its divisors is an integer number (22555110).

Almost surely, 2^85709399 is an apocalyptic number.

85709399 is a deficient number, since it is larger than the sum of its proper divisors (4511041).

85709399 is a wasteful number, since it uses less digits than its factorization.

85709399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4511040.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 85709399 is about 9257.9370812293. The cubic root of 85709399 is about 440.9027591228.

The spelling of 85709399 in words is "eighty-five million, seven hundred nine thousand, three hundred ninety-nine".