13938287 has 4 divisors (see below), whose sum is σ = 15205416. Its totient is φ = 12671160.

The previous prime is 13938277. The next prime is 13938289. The reversal of 13938287 is 78283931.

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 13938287 - 2⁴ = 13938271 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 (13938289) 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, 633548 + ... + 633569.

It is an arithmetic number, because the mean of its divisors is an integer number (3801354).

Almost surely, 2^13938287 is an apocalyptic number.

13938287 is a deficient number, since it is larger than the sum of its proper divisors (1267129).

13938287 is a wasteful number, since it uses less digits than its factorization.

13938287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267128.

The product of its digits is 72576, while the sum is 41.

The square root of 13938287 is about 3733.4015321152. The cubic root of 13938287 is about 240.6595688121.

It can be divided in two parts, 13938 and 287, that multiplied together give a triangular number (4000206 = T₂₈₂₈).

The spelling of 13938287 in words is "thirteen million, nine hundred thirty-eight thousand, two hundred eighty-seven".