212785857 has 24 divisors (see below), whose sum is σ = 322920000. Its totient is φ = 134759328.

The previous prime is 212785823. The next prime is 212785879. The reversal of 212785857 is 758587212.

It is not a de Polignac number, because 212785857 - 2¹² = 212781761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212785897) 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, 27394 + ... + 34292.

It is an arithmetic number, because the mean of its divisors is an integer number (13455000).

Almost surely, 2^212785857 is an apocalyptic number.

It is an amenable number.

212785857 is a deficient number, since it is larger than the sum of its proper divisors (110134143).

212785857 is a wasteful number, since it uses less digits than its factorization.

212785857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077 (or 7074 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 212785857 is about 14587.1812561578. The cubic root of 212785857 is about 597.0090568729.

The spelling of 212785857 in words is "two hundred twelve million, seven hundred eighty-five thousand, eight hundred fifty-seven".