1440402320 has 80 divisors (see below), whose sum is σ = 3832790400. Its totient is φ = 493151232.

The previous prime is 1440402317. The next prime is 1440402329. The reversal of 1440402320 is 232040441.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1440402320² = 4149517686922764800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1440402292 and 1440402301.

It is not an unprimeable number, because it can be changed into a prime (1440402329) 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, 532331 + ... + 535029.

It is an arithmetic number, because the mean of its divisors is an integer number (47909880).

Almost surely, 2^1440402320 is an apocalyptic number.

1440402320 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 1440402320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1916395200).

1440402320 is an abundant number, since it is smaller than the sum of its proper divisors (2392388080).

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

1440402320 is a wasteful number, since it uses less digits than its factorization.

1440402320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672 (or 3666 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 1440402320 is about 37952.6325832609. The cubic root of 1440402320 is about 1129.3483908689.

Adding to 1440402320 its reverse (232040441), we get a palindrome (1672442761).

The spelling of 1440402320 in words is "one billion, four hundred forty million, four hundred two thousand, three hundred twenty".