1243265 has 16 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 899712.

The previous prime is 1243211. The next prime is 1243271. The reversal of 1243265 is 5623421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243265 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243265.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1901 + ... + 2469.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2^1243265 is an apocalyptic number.

It is an amenable number.

1243265 is a deficient number, since it is larger than the sum of its proper divisors (398335).

1243265 is a wasteful number, since it uses less digits than its factorization.

1243265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its digits is 1440, while the sum is 23.

The square root of 1243265 is about 1115.0179370755. The cubic root of 1243265 is about 107.5279177536.

Adding to 1243265 its reverse (5623421), we get a palindrome (6866686).

The spelling of 1243265 in words is "one million, two hundred forty-three thousand, two hundred sixty-five".