216608397 has 16 divisors (see below), whose sum is σ = 299354880. Its totient is φ = 139205952.

The previous prime is 216608363. The next prime is 216608401. The reversal of 216608397 is 793806612.

It is a happy number.

It is not a de Polignac number, because 216608397 - 2⁷ = 216608269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216608317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3148 + ... + 21050.

It is an arithmetic number, because the mean of its divisors is an integer number (18709680).

Almost surely, 2^216608397 is an apocalyptic number.

It is an amenable number.

216608397 is a deficient number, since it is larger than the sum of its proper divisors (82746483).

216608397 is a wasteful number, since it uses less digits than its factorization.

216608397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18052.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 216608397 is about 14717.6219886230. The cubic root of 216608397 is about 600.5628024794.

The spelling of 216608397 in words is "two hundred sixteen million, six hundred eight thousand, three hundred ninety-seven".