1440004121 has 4 divisors (see below), whose sum is σ = 1440113700. Its totient is φ = 1439894544.

The previous prime is 1440004109. The next prime is 1440004177. The reversal of 1440004121 is 1214000441.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1007364121 + 432640000 = 31739^2 + 20800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440004121 is a prime.

It is a super-2 number, since 2×1440004121² = 4147223736993965282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1440004121.

It is not an unprimeable number, because it can be changed into a prime (1440004421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31886 + ... + 62423.

It is an arithmetic number, because the mean of its divisors is an integer number (360028425).

Almost surely, 2^1440004121 is an apocalyptic number.

It is an amenable number.

1440004121 is a deficient number, since it is larger than the sum of its proper divisors (109579).

1440004121 is an equidigital number, since it uses as much as digits as its factorization.

1440004121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109578.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1440004121 is about 37947.3862209244. The cubic root of 1440004121 is about 1129.2443118811.

Adding to 1440004121 its reverse (1214000441), we get a palindrome (2654004562).

The spelling of 1440004121 in words is "one billion, four hundred forty million, four thousand, one hundred twenty-one".