1340426540 has 48 divisors (see below), whose sum is σ = 2996227584. Its totient is φ = 501964800.

The previous prime is 1340426513. The next prime is 1340426543. The reversal of 1340426540 is 456240431.

1340426540 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1340426543) 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, 54620 + ... + 75260.

It is an arithmetic number, because the mean of its divisors is an integer number (62421408).

Almost surely, 2^1340426540 is an apocalyptic number.

1340426540 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 1340426540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1498113792).

1340426540 is an abundant number, since it is smaller than the sum of its proper divisors (1655801044).

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

1340426540 is a wasteful number, since it uses less digits than its factorization.

1340426540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20858 (or 20856 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 1340426540 is about 36611.8360643112. The cubic root of 1340426540 is about 1102.5907364437.

Adding to 1340426540 its reverse (456240431), we get a palindrome (1796666971).

The spelling of 1340426540 in words is "one billion, three hundred forty million, four hundred twenty-six thousand, five hundred forty".