223423440 has 40 divisors (see below), whose sum is σ = 692613408. Its totient is φ = 59579520.

The previous prime is 223423393. The next prime is 223423441. The reversal of 223423440 is 44324322.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 223423440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223423441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 465226 + ... + 465705.

Almost surely, 2^223423440 is an apocalyptic number.

223423440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223423440 is an abundant number, since it is smaller than the sum of its proper divisors (469189968).

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

223423440 is a wasteful number, since it uses less digits than its factorization.

223423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930947 (or 930941 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 24.

The square root of 223423440 is about 14947.3556189715. The cubic root of 223423440 is about 606.7962824664.

Adding to 223423440 its reverse (44324322), we get a palindrome (267747762).

The spelling of 223423440 in words is "two hundred twenty-three million, four hundred twenty-three thousand, four hundred forty".