216387967 has 4 divisors (see below), whose sum is σ = 223368256. Its totient is φ = 209407680.

The previous prime is 216387961. The next prime is 216387989. The reversal of 216387967 is 769783612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216387967 - 2²⁷ = 82170239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216387967.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216387961) 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, 3490098 + ... + 3490159.

It is an arithmetic number, because the mean of its divisors is an integer number (55842064).

Almost surely, 2^216387967 is an apocalyptic number.

216387967 is a deficient number, since it is larger than the sum of its proper divisors (6980289).

216387967 is an equidigital number, since it uses as much as digits as its factorization.

216387967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6980288.

The product of its digits is 762048, while the sum is 49.

The square root of 216387967 is about 14710.1314406092. The cubic root of 216387967 is about 600.3590138426.

The spelling of 216387967 in words is "two hundred sixteen million, three hundred eighty-seven thousand, nine hundred sixty-seven".