1287421345 has 64 divisors (see below), whose sum is σ = 1862784000. Its totient is φ = 853493760.

The previous prime is 1287421307. The next prime is 1287421363. The reversal of 1287421345 is 5431247821.

1287421345 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1287421345 - 2⁹ = 1287420833 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 11811151 + ... + 11811259.

It is an arithmetic number, because the mean of its divisors is an integer number (29106000).

Almost surely, 2^1287421345 is an apocalyptic number.

It is an amenable number.

1287421345 is a deficient number, since it is larger than the sum of its proper divisors (575362655).

1287421345 is an equidigital number, since it uses as much as digits as its factorization.

1287421345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 289 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 1287421345 is about 35880.6541885735. The cubic root of 1287421345 is about 1087.8614031142.

The spelling of 1287421345 in words is "one billion, two hundred eighty-seven million, four hundred twenty-one thousand, three hundred forty-five".