218426 has 16 divisors (see below), whose sum is σ = 365568. Its totient is φ = 97200.

The previous prime is 218423. The next prime is 218437. The reversal of 218426 is 624812.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (218423) 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, 671 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (22848).

2²¹⁸⁴²⁶ is an apocalyptic number.

218426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

218426 is a deficient number, since it is larger than the sum of its proper divisors (147142).

218426 is a wasteful number, since it uses less digits than its factorization.

218426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317.

The product of its digits is 768, while the sum is 23.

The square root of 218426 is about 467.3606744261. The cubic root of 218426 is about 60.2237938636.

The spelling of 218426 in words is "two hundred eighteen thousand, four hundred twenty-six".