223720840 has 32 divisors (see below), whose sum is σ = 575282880. Its totient is φ = 76704192.

The previous prime is 223720807. The next prime is 223720853. The reversal of 223720840 is 48027322.

223720840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 223720799 and 223720808.

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, 399222 + ... + 399781.

It is an arithmetic number, because the mean of its divisors is an integer number (17977590).

Almost surely, 2^223720840 is an apocalyptic number.

223720840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223720840 is an abundant number, since it is smaller than the sum of its proper divisors (351562040).

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

223720840 is a wasteful number, since it uses less digits than its factorization.

223720840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799021 (or 799017 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 223720840 is about 14957.3005585901. The cubic root of 223720840 is about 607.0653995633.

The spelling of 223720840 in words is "two hundred twenty-three million, seven hundred twenty thousand, eight hundred forty".