223421240 has 32 divisors (see below), whose sum is σ = 574512480. Its totient is φ = 76601472.

The previous prime is 223421189. The next prime is 223421251. The reversal of 223421240 is 42124322.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398687 + ... + 399246.

It is an arithmetic number, because the mean of its divisors is an integer number (17953515).

Almost surely, 2^223421240 is an apocalyptic number.

223421240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223421240 is an abundant number, since it is smaller than the sum of its proper divisors (351091240).

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

223421240 is a wasteful number, since it uses less digits than its factorization.

223421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797951 (or 797947 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 223421240 is about 14947.2820271781. The cubic root of 223421240 is about 606.7942907981.

Adding to 223421240 its reverse (42124322), we get a palindrome (265545562).

The spelling of 223421240 in words is "two hundred twenty-three million, four hundred twenty-one thousand, two hundred forty".