13278638 has 8 divisors (see below), whose sum is σ = 20050320. Its totient is φ = 6595200.

The previous prime is 13278637. The next prime is 13278667. The reversal of 13278638 is 83687231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13278637) 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, 21683 + ... + 22286.

It is an arithmetic number, because the mean of its divisors is an integer number (2506290).

Almost surely, 2^13278638 is an apocalyptic number.

13278638 is a deficient number, since it is larger than the sum of its proper divisors (6771682).

13278638 is a wasteful number, since it uses less digits than its factorization.

13278638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44122.

The product of its digits is 48384, while the sum is 38.

The square root of 13278638 is about 3643.9865532134. The cubic root of 13278638 is about 236.8015334809.

The spelling of 13278638 in words is "thirteen million, two hundred seventy-eight thousand, six hundred thirty-eight".