1440320123 has 16 divisors (see below), whose sum is σ = 1606625280. Its totient is φ = 1279977600.

The previous prime is 1440320083. The next prime is 1440320153. The reversal of 1440320123 is 3210230441.

It is a de Polignac number, because none of the positive numbers 2^k-1440320123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1440320095 and 1440320104.

It is not an unprimeable number, because it can be changed into a prime (1440320153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768878 + ... + 770748.

It is an arithmetic number, because the mean of its divisors is an integer number (100414080).

Almost surely, 2^1440320123 is an apocalyptic number.

1440320123 is a deficient number, since it is larger than the sum of its proper divisors (166305157).

1440320123 is a wasteful number, since it uses less digits than its factorization.

1440320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1440320123 is about 37951.5496785046. The cubic root of 1440320123 is about 1129.3269082562.

Adding to 1440320123 its reverse (3210230441), we get a palindrome (4650550564).

The spelling of 1440320123 in words is "one billion, four hundred forty million, three hundred twenty thousand, one hundred twenty-three".