212643894 has 16 divisors (see below), whose sum is σ = 425437632. Its totient is φ = 70856328.

The previous prime is 212643889. The next prime is 212643913. The reversal of 212643894 is 498346212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22117 + ... + 30239.

It is an arithmetic number, because the mean of its divisors is an integer number (26589852).

Almost surely, 2^212643894 is an apocalyptic number.

212643894 is an abundant number, since it is smaller than the sum of its proper divisors (212793738).

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

212643894 is a wasteful number, since it uses less digits than its factorization.

212643894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12491.

The product of its digits is 82944, while the sum is 39.

The square root of 212643894 is about 14582.3144253579. The cubic root of 212643894 is about 596.8762597453.

The spelling of 212643894 in words is "two hundred twelve million, six hundred forty-three thousand, eight hundred ninety-four".