216887397 has 8 divisors (see below), whose sum is σ = 289258944. Its totient is φ = 144553728.

The previous prime is 216887381. The next prime is 216887423. The reversal of 216887397 is 793788612.

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

It is not a de Polignac number, because 216887397 - 2⁴ = 216887381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216887197) 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, 9093 + ... + 22725.

It is an arithmetic number, because the mean of its divisors is an integer number (36157368).

Almost surely, 2^216887397 is an apocalyptic number.

It is an amenable number.

216887397 is a deficient number, since it is larger than the sum of its proper divisors (72371547).

216887397 is a wasteful number, since it uses less digits than its factorization.

216887397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18939.

The product of its digits is 1016064, while the sum is 51.

The square root of 216887397 is about 14727.0973718517. The cubic root of 216887397 is about 600.8205412308.

The spelling of 216887397 in words is "two hundred sixteen million, eight hundred eighty-seven thousand, three hundred ninety-seven".