720126 has 24 divisors (see below), whose sum is σ = 1702584. Its totient is φ = 218160.

The previous prime is 720101. The next prime is 720127. The reversal of 720126 is 621027.

It is a happy number.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 720099 and 720108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720127) by changing a digit.

720126 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, 1621 + ... + 2016.

It is an arithmetic number, because the mean of its divisors is an integer number (70941).

2⁷²⁰¹²⁶ is an apocalyptic number.

720126 is an abundant number, since it is smaller than the sum of its proper divisors (982458).

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

720126 is a wasteful number, since it uses less digits than its factorization.

720126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656 (or 3653 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 720126 is about 848.6023803879. The cubic root of 720126 is about 89.6333229317.

Subtracting from 720126 its reverse (621027), we obtain a palindrome (99099).

It can be divided in two parts, 7201 and 26, that added together give a palindrome (7227).

The spelling of 720126 in words is "seven hundred twenty thousand, one hundred twenty-six".