212943906 has 144 divisors (see below), whose sum is σ = 575134560. Its totient is φ = 56609280.

The previous prime is 212943883. The next prime is 212943911. The reversal of 212943906 is 609349212.

212943906 is a `hidden beast` number, since 212 + 9 + 439 + 0 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1625461 + ... + 1625591.

It is an arithmetic number, because the mean of its divisors is an integer number (3993990).

Almost surely, 2^212943906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212943906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287567280).

212943906 is an abundant number, since it is smaller than the sum of its proper divisors (362190654).

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

212943906 is a wasteful number, since it uses less digits than its factorization.

212943906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 212943906 is about 14592.5976440112. The cubic root of 212943906 is about 597.1568319396.

It can be divided in two parts, 21294 and 3906, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 212943906 in words is "two hundred twelve million, nine hundred forty-three thousand, nine hundred six".