212987894 has 16 divisors (see below), whose sum is σ = 365312256. Its totient is φ = 91233000.

The previous prime is 212987869. The next prime is 212987923. The reversal of 212987894 is 498789212.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43469 + ... + 48119.

It is an arithmetic number, because the mean of its divisors is an integer number (22832016).

Almost surely, 2^212987894 is an apocalyptic number.

212987894 is a deficient number, since it is larger than the sum of its proper divisors (152324362).

212987894 is a wasteful number, since it uses less digits than its factorization.

212987894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7931.

The product of its digits is 580608, while the sum is 50.

The square root of 212987894 is about 14594.1047687071. The cubic root of 212987894 is about 597.1979475033.

It can be divided in two parts, 21298 and 7894, that added together give a palindrome (29192).

The spelling of 212987894 in words is "two hundred twelve million, nine hundred eighty-seven thousand, eight hundred ninety-four".