216600406 has 24 divisors (see below), whose sum is σ = 359578800. Its totient is φ = 97777680.

The previous prime is 216600401. The next prime is 216600409. The reversal of 216600406 is 604006612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216600401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33055 + ... + 39061.

It is an arithmetic number, because the mean of its divisors is an integer number (14982450).

Almost surely, 2^216600406 is an apocalyptic number.

216600406 is a deficient number, since it is larger than the sum of its proper divisors (142978394).

216600406 is a wasteful number, since it uses less digits than its factorization.

216600406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180 (or 6169 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 216600406 is about 14717.3505088382. The cubic root of 216600406 is about 600.5554171758. Note that the first 3 decimals are identical.

The spelling of 216600406 in words is "two hundred sixteen million, six hundred thousand, four hundred six".