721230 has 32 divisors (see below), whose sum is σ = 1792800. Its totient is φ = 185472.

The previous prime is 721229. The next prime is 721243. The reversal of 721230 is 32127.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 456 + ... + 1284.

It is an arithmetic number, because the mean of its divisors is an integer number (56025).

2⁷²¹²³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896400).

721230 is an abundant number, since it is smaller than the sum of its proper divisors (1071570).

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

721230 is a wasteful number, since it uses less digits than its factorization.

721230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 721230 is about 849.2526125953. The cubic root of 721230 is about 89.6791041160.

Adding to 721230 its reverse (32127), we get a palindrome (753357).

The spelling of 721230 in words is "seven hundred twenty-one thousand, two hundred thirty".