1421328781440 has 256 divisors, whose sum is σ = 5102834457600. Its totient is φ = 373828608000.

The previous prime is 1421328781387. The next prime is 1421328781451. The reversal of 1421328781440 is 441878231241.

1421328781440 is a `hidden beast` number, since 1 + 4 + 2 + 132 + 8 + 78 + 1 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 698065 + ... + 1824815.

It is an arithmetic number, because the mean of its divisors is an integer number (19932947100).

Almost surely, 2^{1421328781440} is an apocalyptic number.

1421328781440 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 1421328781440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2551417228800).

1421328781440 is an abundant number, since it is smaller than the sum of its proper divisors (3681505676160).

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

1421328781440 is a wasteful number, since it uses less digits than its factorization.

1421328781440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126852 (or 1126834 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 1421328781440 in words is "one trillion, four hundred twenty-one billion, three hundred twenty-eight million, seven hundred eighty-one thousand, four hundred forty".