13859309 has 4 divisors (see below), whose sum is σ = 13920060. Its totient is φ = 13798560.

The previous prime is 13859299. The next prime is 13859323. The reversal of 13859309 is 90395831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90395831 = 6857 ⋅13183.

It can be written as a sum of positive squares in 2 ways, for example, as 7856809 + 6002500 = 2803^2 + 2450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13859309 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 (13859509) 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, 30032 + ... + 30489.

It is an arithmetic number, because the mean of its divisors is an integer number (3480015).

Almost surely, 2^13859309 is an apocalyptic number.

It is an amenable number.

13859309 is a deficient number, since it is larger than the sum of its proper divisors (60751).

13859309 is an equidigital number, since it uses as much as digits as its factorization.

13859309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60750.

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

The square root of 13859309 is about 3722.8092886958. The cubic root of 13859309 is about 240.2041607681.

The spelling of 13859309 in words is "thirteen million, eight hundred fifty-nine thousand, three hundred nine".