13938509 has 8 divisors (see below), whose sum is σ = 15042720. Its totient is φ = 12838896.

The previous prime is 13938497. The next prime is 13938511. The reversal of 13938509 is 90583931.

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

It is a cyclic number.

It is not a de Polignac number, because 13938509 - 2¹⁶ = 13872973 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 (13938559) 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, 7754 + ... + 9380.

It is an arithmetic number, because the mean of its divisors is an integer number (1880340).

Almost surely, 2^13938509 is an apocalyptic number.

It is an amenable number.

13938509 is a deficient number, since it is larger than the sum of its proper divisors (1104211).

13938509 is a wasteful number, since it uses less digits than its factorization.

13938509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 13938509 is about 3733.4312635965. The cubic root of 13938509 is about 240.6608464952.

The spelling of 13938509 in words is "thirteen million, nine hundred thirty-eight thousand, five hundred nine".