1260321218 has 18 divisors (see below), whose sum is σ = 2048150457. Its totient is φ = 581385480.

The previous prime is 1260321199. The next prime is 1260321229. The reversal of 1260321218 is 8121230621.

It can be written as a sum of positive squares in 2 ways, for example, as 1077611929 + 182709289 = 32827^2 + 13517^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25103.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 651713 + ... + 653643.

Almost surely, 2^1260321218 is an apocalyptic number.

1260321218 is a deficient number, since it is larger than the sum of its proper divisors (787829239).

1260321218 is an frugal number, since it uses more digits than its factorization.

1260321218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890 (or 1946 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1260321218 is about 35501.0030562518. The cubic root of 1260321218 is about 1080.1740740218.

Multiplying 1260321218 by its product of nonzero digits (1152), we get a square (1451890043136 = 1204944²).

Adding to 1260321218 its reverse (8121230621), we get a palindrome (9381551839).

The spelling of 1260321218 in words is "one billion, two hundred sixty million, three hundred twenty-one thousand, two hundred eighteen".