13578987 has 4 divisors (see below), whose sum is σ = 18105320. Its totient is φ = 9052656.

The previous prime is 13578979. The next prime is 13579001. The reversal of 13578987 is 78987531.

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

It is not a de Polignac number, because 13578987 - 2³ = 13578979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13576987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263162 + ... + 2263167.

It is an arithmetic number, because the mean of its divisors is an integer number (4526330).

Almost surely, 2^13578987 is an apocalyptic number.

13578987 is a deficient number, since it is larger than the sum of its proper divisors (4526333).

13578987 is an equidigital number, since it uses as much as digits as its factorization.

13578987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4526332.

The product of its digits is 423360, while the sum is 48.

The square root of 13578987 is about 3684.9677067784. The cubic root of 13578987 is about 238.5736403975.

The spelling of 13578987 in words is "thirteen million, five hundred seventy-eight thousand, nine hundred eighty-seven".