212823805 has 8 divisors (see below), whose sum is σ = 255497472. Its totient is φ = 170186448.

The previous prime is 212823781. The next prime is 212823817. The reversal of 212823805 is 508328212.

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

It is a cyclic number.

It is not a de Polignac number, because 212823805 - 2⁹ = 212823293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6144 + ... + 21526.

It is an arithmetic number, because the mean of its divisors is an integer number (31937184).

Almost surely, 2^212823805 is an apocalyptic number.

It is an amenable number.

212823805 is a deficient number, since it is larger than the sum of its proper divisors (42673667).

212823805 is a wasteful number, since it uses less digits than its factorization.

212823805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18155.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 212823805 is about 14588.4819292482. The cubic root of 212823805 is about 597.0445447470.

The spelling of 212823805 in words is "two hundred twelve million, eight hundred twenty-three thousand, eight hundred five".