216814869 has 12 divisors (see below), whose sum is σ = 313522092. Its totient is φ = 144384000.

The previous prime is 216814867. The next prime is 216814877. The reversal of 216814869 is 968418612.

216814869 is a `hidden beast` number, since 2 + 168 + 1 + 486 + 9 = 666.

216814869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 192932100 + 23882769 = 13890^2 + 4887^2 .

It is not a de Polignac number, because 216814869 - 2¹ = 216814867 is a prime.

It is a super-2 number, since 2×216814869² = 94017374838974322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216814867) 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, 4332 + ... + 21269.

It is an arithmetic number, because the mean of its divisors is an integer number (26126841).

Almost surely, 2^216814869 is an apocalyptic number.

It is an amenable number.

216814869 is a deficient number, since it is larger than the sum of its proper divisors (96707223).

216814869 is a wasteful number, since it uses less digits than its factorization.

216814869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26548 (or 26545 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 216814869 is about 14724.6347662684. The cubic root of 216814869 is about 600.7535615122.

The spelling of 216814869 in words is "two hundred sixteen million, eight hundred fourteen thousand, eight hundred sixty-nine".