216389086 has 4 divisors (see below), whose sum is σ = 324583632. Its totient is φ = 108194542.

The previous prime is 216389071. The next prime is 216389111. The reversal of 216389086 is 680983612.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54097270 + ... + 54097273.

It is an arithmetic number, because the mean of its divisors is an integer number (81145908).

Almost surely, 2^216389086 is an apocalyptic number.

216389086 is a deficient number, since it is larger than the sum of its proper divisors (108194546).

216389086 is a wasteful number, since it uses less digits than its factorization.

216389086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108194545.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 216389086 is about 14710.1694755703. The cubic root of 216389086 is about 600.3600487131.

The spelling of 216389086 in words is "two hundred sixteen million, three hundred eighty-nine thousand, eighty-six".