85409799 has 4 divisors (see below), whose sum is σ = 113879736. Its totient is φ = 56939864.

The previous prime is 85409789. The next prime is 85409809. The reversal of 85409799 is 99790458.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (85409789) and next prime (85409809).

It is a cyclic number.

It is not a de Polignac number, because 85409799 - 2⁴ = 85409783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85409719) 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, 14234964 + ... + 14234969.

It is an arithmetic number, because the mean of its divisors is an integer number (28469934).

Almost surely, 2^85409799 is an apocalyptic number.

85409799 is a deficient number, since it is larger than the sum of its proper divisors (28469937).

85409799 is a wasteful number, since it uses less digits than its factorization.

85409799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28469936.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 85409799 is about 9241.7422058830. The cubic root of 85409799 is about 440.3884293789.

The spelling of 85409799 in words is "eighty-five million, four hundred nine thousand, seven hundred ninety-nine".