1340663 has 4 divisors (see below), whose sum is σ = 1347600. Its totient is φ = 1333728.

The previous prime is 1340653. The next prime is 1340681. The reversal of 1340663 is 3660431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3660431 = 631 ⋅5801.

It is a cyclic number.

It is not a de Polignac number, because 1340663 - 2⁸ = 1340407 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁷ + 4¹⁰ + 0 + 6⁵ + 6⁷ + 3⁷ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3170 + ... + 3567.

It is an arithmetic number, because the mean of its divisors is an integer number (336900).

2^1340663 is an apocalyptic number.

1340663 is a deficient number, since it is larger than the sum of its proper divisors (6937).

1340663 is an equidigital number, since it uses as much as digits as its factorization.

1340663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1340663 is about 1157.8700272483. The cubic root of 1340663 is about 110.2655567368.

The spelling of 1340663 in words is "one million, three hundred forty thousand, six hundred sixty-three".