13540138 has 4 divisors (see below), whose sum is σ = 20310210. Its totient is φ = 6770068.

The previous prime is 13540117. The next prime is 13540139. The reversal of 13540138 is 83104531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11002489 + 2537649 = 3317^2 + 1593^2 .

It is not an unprimeable number, because it can be changed into a prime (13540139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3385033 + ... + 3385036.

Almost surely, 2^13540138 is an apocalyptic number.

13540138 is a deficient number, since it is larger than the sum of its proper divisors (6770072).

13540138 is an equidigital number, since it uses as much as digits as its factorization.

13540138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770071.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 13540138 is about 3679.6926502087. The cubic root of 13540138 is about 238.3459061727.

Adding to 13540138 its reverse (83104531), we get a palindrome (96644669).

The spelling of 13540138 in words is "thirteen million, five hundred forty thousand, one hundred thirty-eight".