13840138 has 8 divisors (see below), whose sum is σ = 22357188. Its totient is φ = 6387744.

The previous prime is 13840121. The next prime is 13840147. The reversal of 13840138 is 83104831.

13840138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13373649 + 466489 = 3657^2 + 683^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266131 + ... + 266182.

Almost surely, 2^13840138 is an apocalyptic number.

13840138 is a deficient number, since it is larger than the sum of its proper divisors (8517050).

13840138 is a wasteful number, since it uses less digits than its factorization.

13840138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532328.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 13840138 is about 3720.2335948163. The cubic root of 13840138 is about 240.0933548859.

Adding to 13840138 its reverse (83104831), we get a palindrome (96944969).

The spelling of 13840138 in words is "thirteen million, eight hundred forty thousand, one hundred thirty-eight".