217924742 has 8 divisors (see below), whose sum is σ = 373585296. Its totient is φ = 93396312.

The previous prime is 217924703. The next prime is 217924753. The reversal of 217924742 is 247429712.

217924742 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 217924696 and 217924705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7783013 + ... + 7783040.

It is an arithmetic number, because the mean of its divisors is an integer number (46698162).

Almost surely, 2^217924742 is an apocalyptic number.

217924742 is a deficient number, since it is larger than the sum of its proper divisors (155660554).

217924742 is a wasteful number, since it uses less digits than its factorization.

217924742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15566062.

The product of its digits is 56448, while the sum is 38.

The square root of 217924742 is about 14762.2742827791. The cubic root of 217924742 is about 601.7769010283.

The spelling of 217924742 in words is "two hundred seventeen million, nine hundred twenty-four thousand, seven hundred forty-two".