13128487 has 12 divisors (see below), whose sum is σ = 14209776. Its totient is φ = 12120480.

The previous prime is 13128461. The next prime is 13128499. The reversal of 13128487 is 78482131.

It is a happy number.

It is not a de Polignac number, because 13128487 - 2¹⁹ = 12604199 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 (13128187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14358 + ... + 15244.

It is an arithmetic number, because the mean of its divisors is an integer number (1184148).

Almost surely, 2^13128487 is an apocalyptic number.

13128487 is a deficient number, since it is larger than the sum of its proper divisors (1081289).

13128487 is an equidigital number, since it uses as much as digits as its factorization.

13128487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 947 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 13128487 is about 3623.3254063084. The cubic root of 13128487 is about 235.9055868155.

The spelling of 13128487 in words is "thirteen million, one hundred twenty-eight thousand, four hundred eighty-seven".