857221606 has 4 divisors (see below), whose sum is σ = 1285832412. Its totient is φ = 428610802.

The previous prime is 857221577. The next prime is 857221627. The reversal of 857221606 is 606122758.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214305400 + ... + 214305403.

It is an arithmetic number, because the mean of its divisors is an integer number (321458103).

Almost surely, 2^857221606 is an apocalyptic number.

857221606 is a deficient number, since it is larger than the sum of its proper divisors (428610806).

857221606 is a wasteful number, since it uses less digits than its factorization.

857221606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428610805.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 857221606 is about 29278.3470503374. The cubic root of 857221606 is about 949.9433414039.

The spelling of 857221606 in words is "eight hundred fifty-seven million, two hundred twenty-one thousand, six hundred six".