223721740 has 72 divisors (see below), whose sum is σ = 520168320. Its totient is φ = 80762880.

The previous prime is 223721731. The next prime is 223721741. The reversal of 223721740 is 47127322.

223721740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 223721699 and 223721708.

It is not an unprimeable number, because it can be changed into a prime (223721741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 466821 + ... + 467299.

It is an arithmetic number, because the mean of its divisors is an integer number (7224560).

Almost surely, 2^223721740 is an apocalyptic number.

223721740 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 223721740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260084160).

223721740 is an abundant number, since it is smaller than the sum of its proper divisors (296446580).

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

223721740 is a wasteful number, since it uses less digits than its factorization.

223721740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 223721740 is about 14957.3306442025. The cubic root of 223721740 is about 607.0662136108.

The spelling of 223721740 in words is "two hundred twenty-three million, seven hundred twenty-one thousand, seven hundred forty".