217942748 has 12 divisors (see below), whose sum is σ = 390269880. Its totient is φ = 106437072.

The previous prime is 217942723. The next prime is 217942763. The reversal of 217942748 is 847249712.

It is a junction number, because it is equal to n+sod(n) for n = 217942699 and 217942708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 633383 + ... + 633726.

It is an arithmetic number, because the mean of its divisors is an integer number (32522490).

Almost surely, 2^217942748 is an apocalyptic number.

It is an amenable number.

217942748 is a deficient number, since it is larger than the sum of its proper divisors (172327132).

217942748 is a wasteful number, since it uses less digits than its factorization.

217942748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267156 (or 1267154 counting only the distinct ones).

The product of its digits is 225792, while the sum is 44.

The square root of 217942748 is about 14762.8841355610. The cubic root of 217942748 is about 601.7934744814.

It can be divided in two parts, 21794 and 2748, that added together give a palindrome (24542).

The spelling of 217942748 in words is "two hundred seventeen million, nine hundred forty-two thousand, seven hundred forty-eight".