1340656019 has 4 divisors (see below), whose sum is σ = 1341024696. Its totient is φ = 1340287344.

The previous prime is 1340656003. The next prime is 1340656027. The reversal of 1340656019 is 9106560431.

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

It is a cyclic number.

It is not a de Polignac number, because 1340656019 - 2⁴ = 1340656003 is a prime.

It is a super-2 number, since 2×1340656019² = 3594717122561856722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1340656019.

It is not an unprimeable number, because it can be changed into a prime (1340656099) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 178829 + ... + 186174.

It is an arithmetic number, because the mean of its divisors is an integer number (335256174).

Almost surely, 2^1340656019 is an apocalyptic number.

1340656019 is a deficient number, since it is larger than the sum of its proper divisors (368677).

1340656019 is an equidigital number, since it uses as much as digits as its factorization.

1340656019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368676.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1340656019 is about 36614.9698757216. The cubic root of 1340656019 is about 1102.6536534766.

The spelling of 1340656019 in words is "one billion, three hundred forty million, six hundred fifty-six thousand, nineteen".