217947982 has 24 divisors (see below), whose sum is σ = 390581784. Its totient is φ = 90880272.

The previous prime is 217947941. The next prime is 217947991. The reversal of 217947982 is 289749712.

217947982 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26428 + ... + 33679.

It is an arithmetic number, because the mean of its divisors is an integer number (16274241).

Almost surely, 2^217947982 is an apocalyptic number.

217947982 is a deficient number, since it is larger than the sum of its proper divisors (172633802).

217947982 is a wasteful number, since it uses less digits than its factorization.

217947982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60160 (or 60153 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The square root of 217947982 is about 14763.0614033811. The cubic root of 217947982 is about 601.7982918962.

The spelling of 217947982 in words is "two hundred seventeen million, nine hundred forty-seven thousand, nine hundred eighty-two".