1365243 has 12 divisors (see below), whose sum is σ = 2001384. Its totient is φ = 827200.

The previous prime is 1365239. The next prime is 1365251. The reversal of 1365243 is 3425631.

It is a happy number.

It is not a de Polignac number, because 1365243 - 2² = 1365239 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

1365243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1365223) 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 11 ways as a sum of consecutive naturals, for example, 1518 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (166782).

2^1365243 is an apocalyptic number.

1365243 is a deficient number, since it is larger than the sum of its proper divisors (636141).

1365243 is a wasteful number, since it uses less digits than its factorization.

1365243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3786 (or 3775 counting only the distinct ones).

The product of its digits is 2160, while the sum is 24.

The square root of 1365243 is about 1168.4361343266. The cubic root of 1365243 is about 110.9353572158.

It can be divided in two parts, 13652 and 43, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 1365243 in words is "one million, three hundred sixty-five thousand, two hundred forty-three".