13478409 has 12 divisors (see below), whose sum is σ = 22250176. Its totient is φ = 7701912.

The previous prime is 13478401. The next prime is 13478431. The reversal of 13478409 is 90487431.

It is a happy number.

It is not a de Polignac number, because 13478409 - 2³ = 13478401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13478401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106909 + ... + 107034.

Almost surely, 2^13478409 is an apocalyptic number.

It is an amenable number.

13478409 is a deficient number, since it is larger than the sum of its proper divisors (8771767).

13478409 is a wasteful number, since it uses less digits than its factorization.

13478409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213956 (or 213953 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 13478409 is about 3671.2952755124. The cubic root of 13478409 is about 237.9831508916.

The spelling of 13478409 in words is "thirteen million, four hundred seventy-eight thousand, four hundred nine".