212163786 has 28 divisors (see below), whose sum is σ = 477153522. Its totient is φ = 70720776.

The previous prime is 212163779. The next prime is 212163851. The reversal of 212163786 is 687361212.

212163786 is a `hidden beast` number, since 2 + 12 + 1 + 637 + 8 + 6 = 666.

212163786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 184443561 + 27720225 = 13581^2 + 5265^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212163786.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 71301 + ... + 74216.

Almost surely, 2^212163786 is an apocalyptic number.

212163786 is an abundant number, since it is smaller than the sum of its proper divisors (264989736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212163786 is an equidigital number, since it uses as much as digits as its factorization.

212163786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145537 (or 145522 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 212163786 is about 14565.8431269872. The cubic root of 212163786 is about 596.4267115955.

The spelling of 212163786 in words is "two hundred twelve million, one hundred sixty-three thousand, seven hundred eighty-six".