218429 has 4 divisors (see below), whose sum is σ = 220476. Its totient is φ = 216384.

The previous prime is 218423. The next prime is 218437. The reversal of 218429 is 924812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60025 + 158404 = 245^2 + 398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218429 is a prime.

It is a super-2 number, since 2×218429² = 95422456082, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 218398 and 218407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218423) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 854 + ... + 1079.

It is an arithmetic number, because the mean of its divisors is an integer number (55119).

2²¹⁸⁴²⁹ is an apocalyptic number.

It is an amenable number.

218429 is a deficient number, since it is larger than the sum of its proper divisors (2047).

218429 is a wasteful number, since it uses less digits than its factorization.

218429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046.

The product of its digits is 1152, while the sum is 26.

The square root of 218429 is about 467.3638839277. The cubic root of 218429 is about 60.2240695795.

It can be divided in two parts, 2184 and 29, that multiplied together give a palindrome (63336).

The spelling of 218429 in words is "two hundred eighteen thousand, four hundred twenty-nine".