1340680738 has 4 divisors (see below), whose sum is σ = 2011021110. Its totient is φ = 670340368.

The previous prime is 1340680721. The next prime is 1340680801. The reversal of 1340680738 is 8370860431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1322558689 + 18122049 = 36367^2 + 4257^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340680738.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335170183 + ... + 335170186.

Almost surely, 2^1340680738 is an apocalyptic number.

1340680738 is a deficient number, since it is larger than the sum of its proper divisors (670340372).

1340680738 is an equidigital number, since it uses as much as digits as its factorization.

1340680738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670340371.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 1340680738 is about 36615.3074273588. The cubic root of 1340680738 is about 1102.6604303400.

The spelling of 1340680738 in words is "one billion, three hundred forty million, six hundred eighty thousand, seven hundred thirty-eight".