123344721 has 8 divisors (see below), whose sum is σ = 182732960. Its totient is φ = 82229796.

The previous prime is 123344719. The next prime is 123344729. The reversal of 123344721 is 127443321.

It is a happy number.

It is not a de Polignac number, because 123344721 - 2¹ = 123344719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 4568323 = 123344721 / (1 + 2 + 3 + 3 + 4 + 4 + 7 + 2 + 1).

It is a Duffinian number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2284135 + ... + 2284188.

It is an arithmetic number, because the mean of its divisors is an integer number (22841620).

Almost surely, 2^123344721 is an apocalyptic number.

It is an amenable number.

123344721 is a deficient number, since it is larger than the sum of its proper divisors (59388239).

123344721 is an equidigital number, since it uses as much as digits as its factorization.

123344721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568332 (or 4568326 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 123344721 is about 11106.0668555524. The cubic root of 123344721 is about 497.7831469849.

It can be divided in two parts, 1233 and 44721, that added together give a palindrome (45954).

The spelling of 123344721 in words is "one hundred twenty-three million, three hundred forty-four thousand, seven hundred twenty-one".