1305540987 has 4 divisors (see below), whose sum is σ = 1740721320. Its totient is φ = 870360656.

The previous prime is 1305540953. The next prime is 1305541001. The reversal of 1305540987 is 7890455031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890455031 = 3 ⋅2630151677.

It is a cyclic number.

It is not a de Polignac number, because 1305540987 - 2¹¹ = 1305538939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1305540917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217590162 + ... + 217590167.

It is an arithmetic number, because the mean of its divisors is an integer number (435180330).

Almost surely, 2^1305540987 is an apocalyptic number.

1305540987 is a deficient number, since it is larger than the sum of its proper divisors (435180333).

1305540987 is an equidigital number, since it uses as much as digits as its factorization.

1305540987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435180332.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 1305540987 is about 36132.2707146949. The cubic root of 1305540987 is about 1092.9412989928.

The spelling of 1305540987 in words is "one billion, three hundred five million, five hundred forty thousand, nine hundred eighty-seven".