223840 has 24 divisors (see below), whose sum is σ = 529200. Its totient is φ = 89472.

The previous prime is 223837. The next prime is 223841. The reversal of 223840 is 48322.

It is a happy number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (22050).

2²²³⁸⁴⁰ is an apocalyptic number.

223840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223840 is an abundant number, since it is smaller than the sum of its proper divisors (305360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

223840 is a wasteful number, since it uses less digits than its factorization.

223840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1406 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 223840 is about 473.1173216022. The cubic root of 223840 is about 60.7173160458.

It can be divided in two parts, 2238 and 40, that added together give a triangular number (2278 = T₆₇).

The spelling of 223840 in words is "two hundred twenty-three thousand, eight hundred forty".