218034381 has 8 divisors (see below), whose sum is σ = 297473440. Its totient is φ = 141975792.

The previous prime is 218034379. The next prime is 218034389. The reversal of 218034381 is 183430812.

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

It is not a de Polignac number, because 218034381 - 2¹ = 218034379 is a prime.

It is a super-2 number, since 2×218034381² = 95077982596106322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218034389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844966 + ... + 845223.

It is an arithmetic number, because the mean of its divisors is an integer number (37184180).

Almost surely, 2^218034381 is an apocalyptic number.

It is an amenable number.

218034381 is a deficient number, since it is larger than the sum of its proper divisors (79439059).

218034381 is a wasteful number, since it uses less digits than its factorization.

218034381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690235.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 218034381 is about 14765.9873019043. The cubic root of 218034381 is about 601.8778030729.

The spelling of 218034381 in words is "two hundred eighteen million, thirty-four thousand, three hundred eighty-one".