216871942 has 12 divisors (see below), whose sum is σ = 378419580. Its totient is φ = 92945076.

The previous prime is 216871937. The next prime is 216871951. The reversal of 216871942 is 249178612.

It is a junction number, because it is equal to n+sod(n) for n = 216871895 and 216871904.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106392 + ... + 1106587.

It is an arithmetic number, because the mean of its divisors is an integer number (31534965).

Almost surely, 2^216871942 is an apocalyptic number.

216871942 is a deficient number, since it is larger than the sum of its proper divisors (161547638).

216871942 is a wasteful number, since it uses less digits than its factorization.

216871942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212995 (or 2212988 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 216871942 is about 14726.5726494660. The cubic root of 216871942 is about 600.8062697668.

The spelling of 216871942 in words is "two hundred sixteen million, eight hundred seventy-one thousand, nine hundred forty-two".