223918 has 4 divisors (see below), whose sum is σ = 335880. Its totient is φ = 111958.

The previous prime is 223903. The next prime is 223919. The reversal of 223918 is 819322.

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

It is an Ulam number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 223892 and 223901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223919) 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 as a sum of consecutive naturals, namely, 55978 + ... + 55981.

It is an arithmetic number, because the mean of its divisors is an integer number (83970).

2²²³⁹¹⁸ is an apocalyptic number.

223918 is a deficient number, since it is larger than the sum of its proper divisors (111962).

223918 is a wasteful number, since it uses less digits than its factorization.

223918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111961.

The product of its digits is 864, while the sum is 25.

The square root of 223918 is about 473.1997464074. The cubic root of 223918 is about 60.7243678100.

The spelling of 223918 in words is "two hundred twenty-three thousand, nine hundred eighteen".