1440420121 has 6 divisors (see below), whose sum is σ = 1675590810. Its totient is φ = 1234645776.

The previous prime is 1440420089. The next prime is 1440420131. The reversal of 1440420121 is 1210240441.

It can be written as a sum of positive squares in only one way, i.e., 1211805721 + 228614400 = 34811^2 + 15120^2 .

It is not a de Polignac number, because 1440420121 - 2⁵ = 1440420089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440420131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14698116 + ... + 14698213.

It is an arithmetic number, because the mean of its divisors is an integer number (279265135).

Almost surely, 2^1440420121 is an apocalyptic number.

It is an amenable number.

1440420121 is a deficient number, since it is larger than the sum of its proper divisors (235170689).

1440420121 is an equidigital number, since it uses as much as digits as its factorization.

1440420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29396343 (or 29396336 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1440420121 is about 37952.8670985474. The cubic root of 1440420121 is about 1129.3530431450.

Adding to 1440420121 its reverse (1210240441), we get a palindrome (2650660562).

The spelling of 1440420121 in words is "one billion, four hundred forty million, four hundred twenty thousand, one hundred twenty-one".