217154140 has 48 divisors (see below), whose sum is σ = 524966400. Its totient is φ = 73910592.

The previous prime is 217154123. The next prime is 217154149. The reversal of 217154140 is 41451712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217154149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13881 + ... + 25039.

It is an arithmetic number, because the mean of its divisors is an integer number (10936800).

Almost surely, 2^217154140 is an apocalyptic number.

217154140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217154140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262483200).

217154140 is an abundant number, since it is smaller than the sum of its proper divisors (307812260).

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

217154140 is a wasteful number, since it uses less digits than its factorization.

217154140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11314 (or 11312 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 217154140 is about 14736.1507864164. The cubic root of 217154140 is about 601.0667504300.

The spelling of 217154140 in words is "two hundred seventeen million, one hundred fifty-four thousand, one hundred forty".