13239287 has 4 divisors (see below), whose sum is σ = 13298880. Its totient is φ = 13179696.

The previous prime is 13239251. The next prime is 13239301. The reversal of 13239287 is 78293231.

13239287 = 124² + 125² + ... + 346².

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

It is a cyclic number.

It is not a de Polignac number, because 13239287 - 2⁶ = 13239223 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 (13239887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29462 + ... + 29907.

It is an arithmetic number, because the mean of its divisors is an integer number (3324720).

Almost surely, 2^13239287 is an apocalyptic number.

13239287 is a deficient number, since it is larger than the sum of its proper divisors (59593).

13239287 is an equidigital number, since it uses as much as digits as its factorization.

13239287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59592.

The product of its digits is 18144, while the sum is 35.

The square root of 13239287 is about 3638.5831033522. The cubic root of 13239287 is about 236.5673830287.

The spelling of 13239287 in words is "thirteen million, two hundred thirty-nine thousand, two hundred eighty-seven".