13478239 has 4 divisors (see below), whose sum is σ = 14187640. Its totient is φ = 12768840.

The previous prime is 13478203. The next prime is 13478251. The reversal of 13478239 is 93287431.

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 13478239 - 2⁹ = 13477727 is a prime.

It is a super-2 number, since 2×13478239² = 363325853082242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13478198 and 13478207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13478539) 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, 354672 + ... + 354709.

It is an arithmetic number, because the mean of its divisors is an integer number (3546910).

Almost surely, 2^13478239 is an apocalyptic number.

13478239 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13478239 is a deficient number, since it is larger than the sum of its proper divisors (709401).

13478239 is an equidigital number, since it uses as much as digits as its factorization.

13478239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709400.

The product of its digits is 36288, while the sum is 37.

The square root of 13478239 is about 3671.2721228479. The cubic root of 13478239 is about 237.9821503455.

The spelling of 13478239 in words is "thirteen million, four hundred seventy-eight thousand, two hundred thirty-nine".