218040255 has 56 divisors (see below), whose sum is σ = 402136560. Its totient is φ = 113374080.

The previous prime is 218040239. The next prime is 218040259. The reversal of 218040255 is 552040812.

It is a happy number.

It is not a de Polignac number, because 218040255 - 2⁴ = 218040239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218040259) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 148716 + ... + 150174.

It is an arithmetic number, because the mean of its divisors is an integer number (7181010).

Almost surely, 2^218040255 is an apocalyptic number.

218040255 is a deficient number, since it is larger than the sum of its proper divisors (184096305).

218040255 is an equidigital number, since it uses as much as digits as its factorization.

218040255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1508 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 218040255 is about 14766.1862036208. The cubic root of 218040255 is about 601.8832080285.

The spelling of 218040255 in words is "two hundred eighteen million, forty thousand, two hundred fifty-five".