85399857 has 24 divisors (see below), whose sum is σ = 131249664. Its totient is φ = 53322624.

The previous prime is 85399837. The next prime is 85399879. The reversal of 85399857 is 75899358.

It is not a de Polignac number, because 85399857 - 2¹⁸ = 85137713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85399807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32868 + ... + 35370.

It is an arithmetic number, because the mean of its divisors is an integer number (5468736).

Almost surely, 2^85399857 is an apocalyptic number.

It is an amenable number.

85399857 is a deficient number, since it is larger than the sum of its proper divisors (45849807).

85399857 is a wasteful number, since it uses less digits than its factorization.

85399857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2746 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The square root of 85399857 is about 9241.2043046348. The cubic root of 85399857 is about 440.3713411302.

The spelling of 85399857 in words is "eighty-five million, three hundred ninety-nine thousand, eight hundred fifty-seven".