1355663 has 4 divisors (see below), whose sum is σ = 1402440. Its totient is φ = 1308888.

The previous prime is 1355659. The next prime is 1355677. The reversal of 1355663 is 3665531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3665531 = 1283 ⋅2857.

It is a cyclic number.

It is not a de Polignac number, because 1355663 - 2² = 1355659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 46747 = 1355663 / (1 + 3 + 5 + 5 + 6 + 6 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355623) 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, 23345 + ... + 23402.

It is an arithmetic number, because the mean of its divisors is an integer number (350610).

2^1355663 is an apocalyptic number.

1355663 is a deficient number, since it is larger than the sum of its proper divisors (46777).

1355663 is an equidigital number, since it uses as much as digits as its factorization.

1355663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46776.

The product of its digits is 8100, while the sum is 29.

The square root of 1355663 is about 1164.3294207397. The cubic root of 1355663 is about 110.6752676740.

The spelling of 1355663 in words is "one million, three hundred fifty-five thousand, six hundred sixty-three".