216947898 has 24 divisors (see below), whose sum is σ = 486263700. Its totient is φ = 69822144.

The previous prime is 216947881. The next prime is 216947917. The reversal of 216947898 is 898749612.

216947898 is a `hidden beast` number, since 2 + 169 + 478 + 9 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 213364449 + 3583449 = 14607^2 + 1893^2 .

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207283 + ... + 208326.

Almost surely, 2^216947898 is an apocalyptic number.

216947898 is an abundant number, since it is smaller than the sum of its proper divisors (269315802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216947898 is a wasteful number, since it uses less digits than its factorization.

216947898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415646 (or 415643 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 216947898 is about 14729.1512993791. The cubic root of 216947898 is about 600.8764025743.

It can be divided in two parts, 21694 and 7898, that added together give a palindrome (29592).

The spelling of 216947898 in words is "two hundred sixteen million, nine hundred forty-seven thousand, eight hundred ninety-eight".