1340120540 has 96 divisors (see below), whose sum is σ = 3421958400. Its totient is φ = 434488320.

The previous prime is 1340120477. The next prime is 1340120543. The reversal of 1340120540 is 450210431.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340120543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61631 + ... + 80489.

It is an arithmetic number, because the mean of its divisors is an integer number (35645400).

Almost surely, 2^1340120540 is an apocalyptic number.

1340120540 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 1340120540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1710979200).

1340120540 is an abundant number, since it is smaller than the sum of its proper divisors (2081837860).

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

1340120540 is a wasteful number, since it uses less digits than its factorization.

1340120540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18915 (or 18913 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1340120540 is about 36607.6568493533. The cubic root of 1340120540 is about 1102.5068282169.

Adding to 1340120540 its reverse (450210431), we get a palindrome (1790330971).

The spelling of 1340120540 in words is "one billion, three hundred forty million, one hundred twenty thousand, five hundred forty".