216871938 has 32 divisors (see below), whose sum is σ = 485147520. Its totient is φ = 71809200.

The previous prime is 216871937. The next prime is 216871951. The reversal of 216871938 is 839178612.

It is a junction number, because it is equal to n+sod(n) for n = 216871893 and 216871902.

It is not an unprimeable number, because it can be changed into a prime (216871933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5145 + ... + 21452.

It is an arithmetic number, because the mean of its divisors is an integer number (15160860).

Almost surely, 2^216871938 is an apocalyptic number.

216871938 is an abundant number, since it is smaller than the sum of its proper divisors (268275582).

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

216871938 is a wasteful number, since it uses less digits than its factorization.

216871938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26759 (or 26753 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 216871938 is about 14726.5725136571. The cubic root of 216871938 is about 600.8062660731.

The spelling of 216871938 in words is "two hundred sixteen million, eight hundred seventy-one thousand, nine hundred thirty-eight".