223211440 has 20 divisors (see below), whose sum is σ = 518966784. Its totient is φ = 89284544.

The previous prime is 223211423. The next prime is 223211447. The reversal of 223211440 is 44112322.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×223211440³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (223211447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1394992 + ... + 1395151.

Almost surely, 2^223211440 is an apocalyptic number.

223211440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223211440 is an abundant number, since it is smaller than the sum of its proper divisors (295755344).

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

223211440 is a wasteful number, since it uses less digits than its factorization.

223211440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790156 (or 2790150 counting only the distinct ones).

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

The square root of 223211440 is about 14940.2623805608. The cubic root of 223211440 is about 606.6042979531.

Adding to 223211440 its reverse (44112322), we get a palindrome (267323762).

The spelling of 223211440 in words is "two hundred twenty-three million, two hundred eleven thousand, four hundred forty".