217182140 has 48 divisors (see below), whose sum is σ = 551904192. Its totient is φ = 70081536.

The previous prime is 217182137. The next prime is 217182151. The reversal of 217182140 is 41281712.

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 15 ways as a sum of consecutive naturals, for example, 43247 + ... + 48006.

It is an arithmetic number, because the mean of its divisors is an integer number (11498004).

Almost surely, 2^217182140 is an apocalyptic number.

217182140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217182140 is an abundant number, since it is smaller than the sum of its proper divisors (334722052).

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

217182140 is a wasteful number, since it uses less digits than its factorization.

217182140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91286 (or 91284 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 217182140 is about 14737.1008003610. The cubic root of 217182140 is about 601.0925833026.

The spelling of 217182140 in words is "two hundred seventeen million, one hundred eighty-two thousand, one hundred forty".