217442532 has 12 divisors (see below), whose sum is σ = 507365936. Its totient is φ = 72480840.

The previous prime is 217442531. The next prime is 217442543. The reversal of 217442532 is 235244712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 217442532.

It is not an unprimeable number, because it can be changed into a prime (217442531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9060094 + ... + 9060117.

Almost surely, 2^217442532 is an apocalyptic number.

It is an amenable number.

217442532 is an abundant number, since it is smaller than the sum of its proper divisors (289923404).

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

217442532 is a wasteful number, since it uses less digits than its factorization.

217442532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18120218 (or 18120216 counting only the distinct ones).

The product of its digits is 13440, while the sum is 30.

The square root of 217442532 is about 14745.9327273659. The cubic root of 217442532 is about 601.3327153689.

The spelling of 217442532 in words is "two hundred seventeen million, four hundred forty-two thousand, five hundred thirty-two".