212879666 has 8 divisors (see below), whose sum is σ = 329620224. Its totient is φ = 103006260.

The previous prime is 212879647. The next prime is 212879701. The reversal of 212879666 is 666978212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 212879666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1716710 + ... + 1716833.

It is an arithmetic number, because the mean of its divisors is an integer number (41202528).

Almost surely, 2^212879666 is an apocalyptic number.

212879666 is a deficient number, since it is larger than the sum of its proper divisors (116740558).

212879666 is a wasteful number, since it uses less digits than its factorization.

212879666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433576.

The product of its digits is 435456, while the sum is 47.

The square root of 212879666 is about 14590.3963619910. The cubic root of 212879666 is about 597.0967766668.

The spelling of 212879666 in words is "two hundred twelve million, eight hundred seventy-nine thousand, six hundred sixty-six".