13278138 has 16 divisors (see below), whose sum is σ = 26676000. Its totient is φ = 4406096.

The previous prime is 13278121. The next prime is 13278157. The reversal of 13278138 is 83187231.

It is a junction number, because it is equal to n+sod(n) for n = 13278099 and 13278108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3513 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (1667250).

Almost surely, 2^13278138 is an apocalyptic number.

13278138 is an abundant number, since it is smaller than the sum of its proper divisors (13397862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13278138 is a wasteful number, since it uses less digits than its factorization.

13278138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9981.

The product of its digits is 8064, while the sum is 33.

The square root of 13278138 is about 3643.9179463868. The cubic root of 13278138 is about 236.7985612320.

The spelling of 13278138 in words is "thirteen million, two hundred seventy-eight thousand, one hundred thirty-eight".