1340142440 has 64 divisors (see below), whose sum is σ = 3711173760. Its totient is φ = 424131840.

The previous prime is 1340142389. The next prime is 1340142451. The reversal of 1340142440 is 442410431.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180446 + ... + 187725.

It is an arithmetic number, because the mean of its divisors is an integer number (57987090).

Almost surely, 2^1340142440 is an apocalyptic number.

1340142440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340142440 is an abundant number, since it is smaller than the sum of its proper divisors (2371031320).

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

1340142440 is a wasteful number, since it uses less digits than its factorization.

1340142440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368202 (or 368198 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1340142440 is about 36607.9559658826. The cubic root of 1340142440 is about 1102.5128338378.

Adding to 1340142440 its reverse (442410431), we get a palindrome (1782552871).

The spelling of 1340142440 in words is "one billion, three hundred forty million, one hundred forty-two thousand, four hundred forty".