216239897 has 8 divisors (see below), whose sum is σ = 220704480. Its totient is φ = 211802080.

The previous prime is 216239879. The next prime is 216239899. The reversal of 216239897 is 798932612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216239897 - 2⁶ = 216239833 is a prime.

It is a super-3 number, since 3×216239897³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216239899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10058 + ... + 23100.

It is an arithmetic number, because the mean of its divisors is an integer number (27588060).

Almost surely, 2^216239897 is an apocalyptic number.

It is an amenable number.

216239897 is a deficient number, since it is larger than the sum of its proper divisors (4464583).

216239897 is a wasteful number, since it uses less digits than its factorization.

216239897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13383.

The product of its digits is 326592, while the sum is 47.

The square root of 216239897 is about 14705.0976535350. The cubic root of 216239897 is about 600.2220446687. Note that the first 3 decimals are identical.

The spelling of 216239897 in words is "two hundred sixteen million, two hundred thirty-nine thousand, eight hundred ninety-seven".