216894388 has 12 divisors (see below), whose sum is σ = 384765220. Its totient is φ = 106961472.

The previous prime is 216894361. The next prime is 216894397. The reversal of 216894388 is 883498612.

It can be written as a sum of positive squares in 2 ways, for example, as 46539684 + 170354704 = 6822^2 + 13052^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371103 + ... + 371686.

Almost surely, 2^216894388 is an apocalyptic number.

It is an amenable number.

216894388 is a deficient number, since it is larger than the sum of its proper divisors (167870832).

216894388 is a wasteful number, since it uses less digits than its factorization.

216894388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742866 (or 742864 counting only the distinct ones).

The product of its digits is 663552, while the sum is 49.

The square root of 216894388 is about 14727.3347215306. The cubic root of 216894388 is about 600.8269966409.

The spelling of 216894388 in words is "two hundred sixteen million, eight hundred ninety-four thousand, three hundred eighty-eight".