217147830 has 32 divisors (see below), whose sum is σ = 543815424. Its totient is φ = 55388256.

The previous prime is 217147823. The next prime is 217147841. The reversal of 217147830 is 38741712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 217147791 and 217147800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156664 + ... + 158043.

It is an arithmetic number, because the mean of its divisors is an integer number (16994232).

Almost surely, 2^217147830 is an apocalyptic number.

217147830 is an abundant number, since it is smaller than the sum of its proper divisors (326667594).

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

217147830 is a wasteful number, since it uses less digits than its factorization.

217147830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314740.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 217147830 is about 14735.9366855317. The cubic root of 217147830 is about 601.0609285011.

The spelling of 217147830 in words is "two hundred seventeen million, one hundred forty-seven thousand, eight hundred thirty".