218135740 has 12 divisors (see below), whose sum is σ = 458085096. Its totient is φ = 87254288.

The previous prime is 218135737. The next prime is 218135777. The reversal of 218135740 is 47531812.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5453374 + ... + 5453413.

It is an arithmetic number, because the mean of its divisors is an integer number (38173758).

Almost surely, 2^218135740 is an apocalyptic number.

218135740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218135740 is an abundant number, since it is smaller than the sum of its proper divisors (239949356).

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

218135740 is a wasteful number, since it uses less digits than its factorization.

218135740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10906796 (or 10906794 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 218135740 is about 14769.4190813315. The cubic root of 218135740 is about 601.9710548512.

The spelling of 218135740 in words is "two hundred eighteen million, one hundred thirty-five thousand, seven hundred forty".