217394838 has 12 divisors (see below), whose sum is σ = 471022188. Its totient is φ = 72464940.

The previous prime is 217394809. The next prime is 217394843. The reversal of 217394838 is 838493712.

It is a junction number, because it is equal to n+sod(n) for n = 217394793 and 217394802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6038728 + ... + 6038763.

It is an arithmetic number, because the mean of its divisors is an integer number (39251849).

Almost surely, 2^217394838 is an apocalyptic number.

217394838 is an abundant number, since it is smaller than the sum of its proper divisors (253627350).

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

217394838 is a wasteful number, since it uses less digits than its factorization.

217394838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12077499 (or 12077496 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 217394838 is about 14744.3154469782. The cubic root of 217394838 is about 601.2887465719.

The spelling of 217394838 in words is "two hundred seventeen million, three hundred ninety-four thousand, eight hundred thirty-eight".