218485380 has 24 divisors (see below), whose sum is σ = 611759232. Its totient is φ = 58262752.

The previous prime is 218485369. The next prime is 218485381. The reversal of 218485380 is 83584812.

It is a super-2 number, since 2×218485380² = 95471722547488800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218485381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820652 + ... + 1820771.

It is an arithmetic number, because the mean of its divisors is an integer number (25489968).

Almost surely, 2^218485380 is an apocalyptic number.

218485380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218485380 is an abundant number, since it is smaller than the sum of its proper divisors (393273852).

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

218485380 is a wasteful number, since it uses less digits than its factorization.

218485380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641435 (or 3641433 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 218485380 is about 14781.2509619450. The cubic root of 218485380 is about 602.2925073055.

The spelling of 218485380 in words is "two hundred eighteen million, four hundred eighty-five thousand, three hundred eighty".