13731239 has 8 divisors (see below), whose sum is σ = 14345760. Its totient is φ = 13126176.

The previous prime is 13731217. The next prime is 13731251. The reversal of 13731239 is 93213731.

13731239 = 37² + 38² + ... + 345².

13731239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13731239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13731209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689 + ... + 5285.

It is an arithmetic number, because the mean of its divisors is an integer number (1793220).

Almost surely, 2^13731239 is an apocalyptic number.

13731239 is a deficient number, since it is larger than the sum of its proper divisors (614521).

13731239 is a wasteful number, since it uses less digits than its factorization.

13731239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729.

The product of its digits is 3402, while the sum is 29.

The square root of 13731239 is about 3705.5686473199. The cubic root of 13731239 is about 239.4619834679.

The spelling of 13731239 in words is "thirteen million, seven hundred thirty-one thousand, two hundred thirty-nine".