218541380 has 24 divisors (see below), whose sum is σ = 459229848. Its totient is φ = 87360768.

The previous prime is 218541353. The next prime is 218541397. The reversal of 218541380 is 83145812.

It can be written as a sum of positive squares in 4 ways, for example, as 33856 + 218507524 = 184^2 + 14782^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45242 + ... + 49838.

It is an arithmetic number, because the mean of its divisors is an integer number (19134577).

Almost surely, 2^218541380 is an apocalyptic number.

218541380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218541380 is an abundant number, since it is smaller than the sum of its proper divisors (240688468).

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

218541380 is a wasteful number, since it uses less digits than its factorization.

218541380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6983 (or 6981 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 218541380 is about 14783.1451322105. The cubic root of 218541380 is about 602.3439607852.

The spelling of 218541380 in words is "two hundred eighteen million, five hundred forty-one thousand, three hundred eighty".