13478391 has 36 divisors (see below), whose sum is σ = 21567000. Its totient is φ = 8087904.

The previous prime is 13478389. The next prime is 13478401. The reversal of 13478391 is 19387431.

It is a happy number.

It is not a de Polignac number, because 13478391 - 2¹ = 13478389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13478321) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 90385 + ... + 90533.

Almost surely, 2^13478391 is an apocalyptic number.

13478391 is a deficient number, since it is larger than the sum of its proper divisors (8088609).

13478391 is a wasteful number, since it uses less digits than its factorization.

13478391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 194 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 13478391 is about 3671.2928240608. The cubic root of 13478391 is about 237.9830449518.

The spelling of 13478391 in words is "thirteen million, four hundred seventy-eight thousand, three hundred ninety-one".