1305897487 has 4 divisors (see below), whose sum is σ = 1336267240. Its totient is φ = 1275527736.

The previous prime is 1305897451. The next prime is 1305897497. The reversal of 1305897487 is 7847985031.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1305897487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305897497) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15184812 + ... + 15184897.

It is an arithmetic number, because the mean of its divisors is an integer number (334066810).

Almost surely, 2^1305897487 is an apocalyptic number.

1305897487 is a deficient number, since it is larger than the sum of its proper divisors (30369753).

1305897487 is an equidigital number, since it uses as much as digits as its factorization.

1305897487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30369752.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The square root of 1305897487 is about 36137.2036411231. The cubic root of 1305897487 is about 1093.0407719615.

The spelling of 1305897487 in words is "one billion, three hundred five million, eight hundred ninety-seven thousand, four hundred eighty-seven".