1365663 has 24 divisors (see below), whose sum is σ = 2090928. Its totient is φ = 787968.

The previous prime is 1365659. The next prime is 1365667. The reversal of 1365663 is 3665631.

It is an interprime number because it is at equal distance from previous prime (1365659) and next prime (1365667).

It is not a de Polignac number, because 1365663 - 2² = 1365659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1365663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365667) 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 23 ways as a sum of consecutive naturals, for example, 14031 + ... + 14127.

It is an arithmetic number, because the mean of its divisors is an integer number (87122).

2^1365663 is an apocalyptic number.

1365663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1365663 is a deficient number, since it is larger than the sum of its proper divisors (725265).

1365663 is a wasteful number, since it uses less digits than its factorization.

1365663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 132 counting only the distinct ones).

The product of its digits is 9720, while the sum is 30.

The square root of 1365663 is about 1168.6158479158. The cubic root of 1365663 is about 110.9467320096.

Subtracting 1365663 from its reverse (3665631), we obtain a cube (2299968 = 132³).

The spelling of 1365663 in words is "one million, three hundred sixty-five thousand, six hundred sixty-three".