216208906 has 8 divisors (see below), whose sum is σ = 324424224. Its totient is φ = 108067500.

The previous prime is 216208903. The next prime is 216208913. The reversal of 216208906 is 609802612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×216208906³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (216208903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10470 + ... + 23281.

It is an arithmetic number, because the mean of its divisors is an integer number (40553028).

Almost surely, 2^216208906 is an apocalyptic number.

216208906 is a deficient number, since it is larger than the sum of its proper divisors (108215318).

216208906 is a wasteful number, since it uses less digits than its factorization.

216208906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36956.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 216208906 is about 14704.0438655494. The cubic root of 216208906 is about 600.1933691554.

It can be divided in two parts, 21 and 6208906, that multiplied together give a triangular number (130387026 = T₁₆₁₄₈).

The spelling of 216208906 in words is "two hundred sixteen million, two hundred eight thousand, nine hundred six".