216670938 has 16 divisors (see below), whose sum is σ = 472736736. Its totient is φ = 65657840.

The previous prime is 216670921. The next prime is 216670939. The reversal of 216670938 is 839076612.

It is a happy number.

216670938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 216670938.

It is not an unprimeable number, because it can be changed into a prime (216670939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1641381 + ... + 1641512.

It is an arithmetic number, because the mean of its divisors is an integer number (29546046).

Almost surely, 2^216670938 is an apocalyptic number.

216670938 is an abundant number, since it is smaller than the sum of its proper divisors (256065798).

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

216670938 is a wasteful number, since it uses less digits than its factorization.

216670938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282909.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 216670938 is about 14719.7465331438. The cubic root of 216670938 is about 600.6205967670.

The spelling of 216670938 in words is "two hundred sixteen million, six hundred seventy thousand, nine hundred thirty-eight".