123344720 has 20 divisors (see below), whose sum is σ = 286776660. Its totient is φ = 49337856.

The previous prime is 123344719. The next prime is 123344729. The reversal of 123344720 is 27443321.

It can be written as a sum of positive squares in 2 ways, for example, as 17007376 + 106337344 = 4124^2 + 10312^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 123344720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123344729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770825 + ... + 770984.

It is an arithmetic number, because the mean of its divisors is an integer number (14338833).

Almost surely, 2^123344720 is an apocalyptic number.

123344720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123344720 is an abundant number, since it is smaller than the sum of its proper divisors (163431940).

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

123344720 is a wasteful number, since it uses less digits than its factorization.

123344720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541822 (or 1541816 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 123344720 is about 11106.0668105320. The cubic root of 123344720 is about 497.7831456396.

The spelling of 123344720 in words is "one hundred twenty-three million, three hundred forty-four thousand, seven hundred twenty".