1365863 has 4 divisors (see below), whose sum is σ = 1391688. Its totient is φ = 1340040.

The previous prime is 1365821. The next prime is 1365869. The reversal of 1365863 is 3685631.

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 1365863 - 2⁶ = 1365799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365869) 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, 12833 + ... + 12938.

It is an arithmetic number, because the mean of its divisors is an integer number (347922).

2^1365863 is an apocalyptic number.

1365863 is a deficient number, since it is larger than the sum of its proper divisors (25825).

1365863 is an equidigital number, since it uses as much as digits as its factorization.

1365863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25824.

The product of its digits is 12960, while the sum is 32.

The square root of 1365863 is about 1168.7014161025. The cubic root of 1365863 is about 110.9521477584.

The spelling of 1365863 in words is "one million, three hundred sixty-five thousand, eight hundred sixty-three".