217385042 has 16 divisors (see below), whose sum is σ = 392274240. Its totient is φ = 88261488.

The previous prime is 217385041. The next prime is 217385093. The reversal of 217385042 is 240583712.

217385042 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (217385041) 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, 408353 + ... + 408884.

It is an arithmetic number, because the mean of its divisors is an integer number (24517140).

Almost surely, 2^217385042 is an apocalyptic number.

217385042 is a deficient number, since it is larger than the sum of its proper divisors (174889198).

217385042 is a wasteful number, since it uses less digits than its factorization.

217385042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817265.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 217385042 is about 14743.9832474132. The cubic root of 217385042 is about 601.2797149054.

The spelling of 217385042 in words is "two hundred seventeen million, three hundred eighty-five thousand, forty-two".