1340788665 has 16 divisors (see below), whose sum is σ = 2145739968. Its totient is φ = 714927936.

The previous prime is 1340788663. The next prime is 1340788667. The reversal of 1340788665 is 5668870431.

It is an interprime number because it is at equal distance from previous prime (1340788663) and next prime (1340788667).

It is not a de Polignac number, because 1340788665 - 2¹ = 1340788663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1340788661) 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, 95859 + ... + 108951.

It is an arithmetic number, because the mean of its divisors is an integer number (134108748).

Almost surely, 2^1340788665 is an apocalyptic number.

1340788665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1340788665 is a deficient number, since it is larger than the sum of its proper divisors (804951303).

1340788665 is a wasteful number, since it uses less digits than its factorization.

1340788665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19928.

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 1340788665 is about 36616.7811938734. The cubic root of 1340788665 is about 1102.6900182042.

The spelling of 1340788665 in words is "one billion, three hundred forty million, seven hundred eighty-eight thousand, six hundred sixty-five".