857222986 has 8 divisors (see below), whose sum is σ = 1290838500. Its totient is φ = 426943488.

The previous prime is 857222969. The next prime is 857222987. The reversal of 857222986 is 689222758.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 839202961 + 18020025 = 28969^2 + 4245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 833361 + ... + 834388.

Almost surely, 2^857222986 is an apocalyptic number.

857222986 is a deficient number, since it is larger than the sum of its proper divisors (433615514).

857222986 is a wasteful number, since it uses less digits than its factorization.

857222986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668008.

The product of its digits is 967680, while the sum is 49.

The square root of 857222986 is about 29278.3706172321. The cubic root of 857222986 is about 949.9438511597.

The spelling of 857222986 in words is "eight hundred fifty-seven million, two hundred twenty-two thousand, nine hundred eighty-six".