1440440420 has 48 divisors (see below), whose sum is σ = 3151830528. Its totient is φ = 552353280.

The previous prime is 1440440401. The next prime is 1440440467. The reversal of 1440440420 is 240440441.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55484 + ... + 77196.

It is an arithmetic number, because the mean of its divisors is an integer number (65663136).

Almost surely, 2^1440440420 is an apocalyptic number.

1440440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1440440420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1575915264).

1440440420 is an abundant number, since it is smaller than the sum of its proper divisors (1711390108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1440440420 is a wasteful number, since it uses less digits than its factorization.

1440440420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21860 (or 21858 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 1440440420 is about 37953.1345214068. The cubic root of 1440440420 is about 1129.3583482245.

Adding to 1440440420 its reverse (240440441), we get a palindrome (1680880861).

The spelling of 1440440420 in words is "one billion, four hundred forty million, four hundred forty thousand, four hundred twenty".