216039938 has 8 divisors (see below), whose sum is σ = 325083132. Its totient is φ = 107678896.

The previous prime is 216039931. The next prime is 216039949. The reversal of 216039938 is 839930612.

216039938 is digitally balanced in base 3, 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 176438089 + 39601849 = 13283^2 + 6293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×216039938² = 93346509622087688, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 216039895 and 216039904.

It is not an unprimeable number, because it can be changed into a prime (216039931) 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, 169745 + ... + 171012.

Almost surely, 2^216039938 is an apocalyptic number.

216039938 is a deficient number, since it is larger than the sum of its proper divisors (109043194).

216039938 is a wasteful number, since it uses less digits than its factorization.

216039938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341076.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 216039938 is about 14698.2971122508. The cubic root of 216039938 is about 600.0369773507.

The spelling of 216039938 in words is "two hundred sixteen million, thirty-nine thousand, nine hundred thirty-eight".