857222985 has 16 divisors (see below), whose sum is σ = 1372029120. Its totient is φ = 457028160.

The previous prime is 857222969. The next prime is 857222987. The reversal of 857222985 is 589222758.

It is a happy number.

It is not a de Polignac number, because 857222985 - 2⁴ = 857222969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (857222987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45046 + ... + 61184.

It is an arithmetic number, because the mean of its divisors is an integer number (85751820).

Almost surely, 2^857222985 is an apocalyptic number.

It is an amenable number.

857222985 is a deficient number, since it is larger than the sum of its proper divisors (514806135).

857222985 is a wasteful number, since it uses less digits than its factorization.

857222985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688.

The product of its digits is 806400, while the sum is 48.

The square root of 857222985 is about 29278.3706001546. The cubic root of 857222985 is about 949.9438507904.

The spelling of 857222985 in words is "eight hundred fifty-seven million, two hundred twenty-two thousand, nine hundred eighty-five".