722340 has 36 divisors (see below), whose sum is σ = 2191644. Its totient is φ = 192576.

The previous prime is 722333. The next prime is 722341. The reversal of 722340 is 43227.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 443556 + 278784 = 666^2 + 528^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

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

It is a d-powerful number, because it can be written as 7⁵ + 2 + 3¹¹ + 2¹⁹ + 4⁶ + 0 .

It is not an unprimeable number, because it can be changed into a prime (722341) by changing a digit.

722340 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1827 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (60879).

2⁷²²³⁴⁰ is an apocalyptic number.

It is an amenable number.

722340 is an abundant number, since it is smaller than the sum of its proper divisors (1469304).

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

722340 is a wasteful number, since it uses less digits than its factorization.

722340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4023 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 722340 is about 849.9058771417. The cubic root of 722340 is about 89.7250870350.

Adding to 722340 its reverse (43227), we get a palindrome (765567).

The spelling of 722340 in words is "seven hundred twenty-two thousand, three hundred forty", and thus it is an iban number.