217203742 has 8 divisors (see below), whose sum is σ = 372349296. Its totient is φ = 93087312.

The previous prime is 217203731. The next prime is 217203751. The reversal of 217203742 is 247302712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 217203742.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7757263 + ... + 7757290.

It is an arithmetic number, because the mean of its divisors is an integer number (46543662).

Almost surely, 2^217203742 is an apocalyptic number.

217203742 is a deficient number, since it is larger than the sum of its proper divisors (155145554).

217203742 is a wasteful number, since it uses less digits than its factorization.

217203742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15514562.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 217203742 is about 14737.8336942714. The cubic root of 217203742 is about 601.1125118466.

The spelling of 217203742 in words is "two hundred seventeen million, two hundred three thousand, seven hundred forty-two".