218987740 has 12 divisors (see below), whose sum is σ = 459874296. Its totient is φ = 87595088.

The previous prime is 218987723. The next prime is 218987753. The reversal of 218987740 is 47789812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5474674 + ... + 5474713.

It is an arithmetic number, because the mean of its divisors is an integer number (38322858).

Almost surely, 2^218987740 is an apocalyptic number.

218987740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218987740 is an abundant number, since it is smaller than the sum of its proper divisors (240886556).

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

218987740 is a wasteful number, since it uses less digits than its factorization.

218987740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10949396 (or 10949394 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 218987740 is about 14798.2343541383. The cubic root of 218987740 is about 602.7537678612.

The spelling of 218987740 in words is "two hundred eighteen million, nine hundred eighty-seven thousand, seven hundred forty".