13409839 has 4 divisors (see below), whose sum is σ = 14115640. Its totient is φ = 12704040.

The previous prime is 13409831. The next prime is 13409843. The reversal of 13409839 is 93890431.

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 13409839 - 2³ = 13409831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13409798 and 13409807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13409831) 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, 352872 + ... + 352909.

It is an arithmetic number, because the mean of its divisors is an integer number (3528910).

Almost surely, 2^13409839 is an apocalyptic number.

13409839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13409839 is a deficient number, since it is larger than the sum of its proper divisors (705801).

13409839 is an equidigital number, since it uses as much as digits as its factorization.

13409839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705800.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 13409839 is about 3661.9447019309. The cubic root of 13409839 is about 237.5788930885.

The spelling of 13409839 in words is "thirteen million, four hundred nine thousand, eight hundred thirty-nine".