1243105 has 4 divisors (see below), whose sum is σ = 1491732. Its totient is φ = 994480.

The previous prime is 1243097. The next prime is 1243111. The reversal of 1243105 is 5013421.

1243105 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 535824 + 707281 = 732^2 + 841^2 .

It is not a de Polignac number, because 1243105 - 2³ = 1243097 is a prime.

It is a Duffinian number.

1243105 is a lucky number.

It is an unprimeable number.

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, 124306 + ... + 124315.

It is an arithmetic number, because the mean of its divisors is an integer number (372933).

2^1243105 is an apocalyptic number.

It is an amenable number.

1243105 is a deficient number, since it is larger than the sum of its proper divisors (248627).

1243105 is an equidigital number, since it uses as much as digits as its factorization.

1243105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248626.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1243105 is about 1114.9461870422. The cubic root of 1243105 is about 107.5233048446.

Adding to 1243105 its product of nonzero digits (120), we get a square (1243225 = 1115²).

Adding to 1243105 its reverse (5013421), we get a palindrome (6256526).

The spelling of 1243105 in words is "one million, two hundred forty-three thousand, one hundred five".