13812239 has 4 divisors (see below), whose sum is σ = 15785424. Its totient is φ = 11839056.

The previous prime is 13812233. The next prime is 13812263. The reversal of 13812239 is 93221831.

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-13812239 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 (13812233) 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 3 ways as a sum of consecutive naturals, for example, 986582 + ... + 986595.

It is an arithmetic number, because the mean of its divisors is an integer number (3946356).

Almost surely, 2^13812239 is an apocalyptic number.

13812239 is a deficient number, since it is larger than the sum of its proper divisors (1973185).

13812239 is an equidigital number, since it uses as much as digits as its factorization.

13812239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973184.

The product of its digits is 2592, while the sum is 29.

The square root of 13812239 is about 3716.4820731439. The cubic root of 13812239 is about 239.9319193468.

The spelling of 13812239 in words is "thirteen million, eight hundred twelve thousand, two hundred thirty-nine".