1440120423 has 16 divisors (see below), whose sum is σ = 2195035136. Its totient is φ = 822713760.

The previous prime is 1440120403. The next prime is 1440120431. The reversal of 1440120423 is 3240210441.

It is not a de Polignac number, because 1440120423 - 2¹³ = 1440112231 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1440120423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440120403) 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, 114633 + ... + 126573.

It is an arithmetic number, because the mean of its divisors is an integer number (137189696).

Almost surely, 2^1440120423 is an apocalyptic number.

1440120423 is a deficient number, since it is larger than the sum of its proper divisors (754914713).

1440120423 is a wasteful number, since it uses less digits than its factorization.

1440120423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17694.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1440120423 is about 37948.9186011934. The cubic root of 1440120423 is about 1129.2747122192.

Adding to 1440120423 its reverse (3240210441), we get a palindrome (4680330864).

The spelling of 1440120423 in words is "one billion, four hundred forty million, one hundred twenty thousand, four hundred twenty-three".