217240342 has 16 divisors (see below), whose sum is σ = 356638464. Its totient is φ = 98425000.

The previous prime is 217240321. The next prime is 217240349. The reversal of 217240342 is 243042712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217240349) 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, 9034 + ... + 22717.

It is an arithmetic number, because the mean of its divisors is an integer number (22289904).

Almost surely, 2^217240342 is an apocalyptic number.

217240342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

217240342 is a deficient number, since it is larger than the sum of its proper divisors (139398122).

217240342 is a wasteful number, since it uses less digits than its factorization.

217240342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32075.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 217240342 is about 14739.0753441320. The cubic root of 217240342 is about 601.1462735153.

The spelling of 217240342 in words is "two hundred seventeen million, two hundred forty thousand, three hundred forty-two".