1243505104 has 10 divisors (see below), whose sum is σ = 2409291170. Its totient is φ = 621752544.

The previous prime is 1243505099. The next prime is 1243505117. The reversal of 1243505104 is 4015053421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1008189504 + 235315600 = 31752^2 + 15340^2 .

It is a congruent 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 as a sum of consecutive naturals, namely, 38859519 + ... + 38859550.

It is an arithmetic number, because the mean of its divisors is an integer number (240929117).

Almost surely, 2^1243505104 is an apocalyptic number.

It is an amenable number.

1243505104 is a deficient number, since it is larger than the sum of its proper divisors (1165786066).

1243505104 is an equidigital number, since it uses as much as digits as its factorization.

1243505104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77719077 (or 77719071 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1243505104 is about 35263.3677348038. The cubic root of 1243505104 is about 1075.3483937301.

Adding to 1243505104 its reverse (4015053421), we get a palindrome (5258558525).

The spelling of 1243505104 in words is "one billion, two hundred forty-three million, five hundred five thousand, one hundred four".