1340401440 has 192 divisors, whose sum is σ = 4843044864. Its totient is φ = 305261568.

The previous prime is 1340401427. The next prime is 1340401451. The reversal of 1340401440 is 441040431.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 1232577 + ... + 1233663.

It is an arithmetic number, because the mean of its divisors is an integer number (25224192).

Almost surely, 2^1340401440 is an apocalyptic number.

1340401440 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 1340401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2421522432).

1340401440 is an abundant number, since it is smaller than the sum of its proper divisors (3502643424).

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

1340401440 is a wasteful number, since it uses less digits than its factorization.

1340401440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1340401440 is about 36611.4932773849. The cubic root of 1340401440 is about 1102.5838542562.

Adding to 1340401440 its reverse (441040431), we get a palindrome (1781441871).

The spelling of 1340401440 in words is "one billion, three hundred forty million, four hundred one thousand, four hundred forty".