218955 has 16 divisors (see below), whose sum is σ = 382464. Its totient is φ = 106080.

The previous prime is 218947. The next prime is 218963. The reversal of 218955 is 559812.

218955 = T₁₉₄ + T₁₉₅ + ... + T₂₀₄.

It is an interprime number because it is at equal distance from previous prime (218947) and next prime (218963).

It is not a de Polignac number, because 218955 - 2³ = 218947 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 828.

It is an arithmetic number, because the mean of its divisors is an integer number (23904).

2²¹⁸⁹⁵⁵ is an apocalyptic number.

218955 is a deficient number, since it is larger than the sum of its proper divisors (163509).

218955 is a wasteful number, since it uses less digits than its factorization.

218955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its digits is 3600, while the sum is 30.

The square root of 218955 is about 467.9262762445. The cubic root of 218955 is about 60.2723727912.

The spelling of 218955 in words is "two hundred eighteen thousand, nine hundred fifty-five".