217898442 has 24 divisors (see below), whose sum is σ = 487344000. Its totient is φ = 70289640.

The previous prime is 217898407. The next prime is 217898459. The reversal of 217898442 is 244898712.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194692 + ... + 195807.

It is an arithmetic number, because the mean of its divisors is an integer number (20306000).

Almost surely, 2^217898442 is an apocalyptic number.

217898442 is an abundant number, since it is smaller than the sum of its proper divisors (269445558).

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

217898442 is a wasteful number, since it uses less digits than its factorization.

217898442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390538 (or 390535 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 217898442 is about 14761.3834717482. The cubic root of 217898442 is about 601.7526918004.

The spelling of 217898442 in words is "two hundred seventeen million, eight hundred ninety-eight thousand, four hundred forty-two".