223312440 has 128 divisors (see below), whose sum is σ = 725578560. Its totient is φ = 54657024.

The previous prime is 223312433. The next prime is 223312471. The reversal of 223312440 is 44213322.

223312440 = T₇₀₄₀ + T₇₀₄₁ + ... + T₇₀₄₈.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400642 + ... + 401198.

Almost surely, 2^223312440 is an apocalyptic number.

223312440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223312440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362789280).

223312440 is an abundant number, since it is smaller than the sum of its proper divisors (502266120).

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

223312440 is a wasteful number, since it uses less digits than its factorization.

223312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 223312440 is about 14943.6421263359. The cubic root of 223312440 is about 606.6957774275.

Adding to 223312440 its reverse (44213322), we get a palindrome (267525762).

The spelling of 223312440 in words is "two hundred twenty-three million, three hundred twelve thousand, four hundred forty".