1440423660 has 96 divisors (see below), whose sum is σ = 4350870720. Its totient is φ = 353958912.

The previous prime is 1440423659. The next prime is 1440423667. The reversal of 1440423660 is 663240441.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1440423667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 601746 + ... + 604134.

It is an arithmetic number, because the mean of its divisors is an integer number (45321570).

Almost surely, 2^1440423660 is an apocalyptic number.

1440423660 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 1440423660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2175435360).

1440423660 is an abundant number, since it is smaller than the sum of its proper divisors (2910447060).

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

1440423660 is a wasteful number, since it uses less digits than its factorization.

1440423660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187 (or 3185 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 1440423660 is about 37952.9137221373. The cubic root of 1440423660 is about 1129.3539680550.

The spelling of 1440423660 in words is "one billion, four hundred forty million, four hundred twenty-three thousand, six hundred sixty".