13705138 has 4 divisors (see below), whose sum is σ = 20557710. Its totient is φ = 6852568.

The previous prime is 13705117. The next prime is 13705147. The reversal of 13705138 is 83150731.

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., 8922169 + 4782969 = 2987^2 + 2187^2 .

It is an unprimeable number.

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, 3426283 + ... + 3426286.

Almost surely, 2^13705138 is an apocalyptic number.

13705138 is a deficient number, since it is larger than the sum of its proper divisors (6852572).

13705138 is an equidigital number, since it uses as much as digits as its factorization.

13705138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852571.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 13705138 is about 3702.0451104761. The cubic root of 13705138 is about 239.3101602749.

Adding to 13705138 its reverse (83150731), we get a palindrome (96855869).

The spelling of 13705138 in words is "thirteen million, seven hundred five thousand, one hundred thirty-eight".