724122 has 36 divisors (see below), whose sum is σ = 1827306. Its totient is φ = 206640.

The previous prime is 724121. The next prime is 724123. The reversal of 724122 is 221427.

It is an interprime number because it is at equal distance from previous prime (724121) and next prime (724123).

It can be written as a sum of positive squares in only one way, i.e., 670761 + 53361 = 819^2 + 231^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 724095 and 724104.

It is not an unprimeable number, because it can be changed into a prime (724121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 472 + ... + 1292.

2⁷²⁴¹²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 724122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913653).

724122 is an abundant number, since it is smaller than the sum of its proper divisors (1103184).

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

724122 is a wasteful number, since it uses less digits than its factorization.

724122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 833 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 724122 is about 850.9535827529. The cubic root of 724122 is about 89.7988098446.

Adding to 724122 its reverse (221427), we get a palindrome (945549).

The spelling of 724122 in words is "seven hundred twenty-four thousand, one hundred twenty-two", and thus it is an iban number.