218640382 has 8 divisors (see below), whose sum is σ = 332579952. Its totient is φ = 107780400.

The previous prime is 218640379. The next prime is 218640397. The reversal of 218640382 is 283046812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×218640382² = 95607233282211848, which contains 22 as substring.

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, 769719 + ... + 770002.

It is an arithmetic number, because the mean of its divisors is an integer number (41572494).

Almost surely, 2^218640382 is an apocalyptic number.

218640382 is a deficient number, since it is larger than the sum of its proper divisors (113939570).

218640382 is a wasteful number, since it uses less digits than its factorization.

218640382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539794.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 218640382 is about 14786.4932286192. The cubic root of 218640382 is about 602.4349035229.

The spelling of 218640382 in words is "two hundred eighteen million, six hundred forty thousand, three hundred eighty-two".