16438139 has 4 divisors (see below), whose sum is σ = 16452024. Its totient is φ = 16424256.

The previous prime is 16438063. The next prime is 16438141. The reversal of 16438139 is 93183461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16438139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16438099 and 16438108.

It is not an unprimeable number, because it can be changed into a prime (16438039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4982 + ... + 7595.

It is an arithmetic number, because the mean of its divisors is an integer number (4113006).

Almost surely, 2^16438139 is an apocalyptic number.

16438139 is a deficient number, since it is larger than the sum of its proper divisors (13885).

16438139 is a wasteful number, since it uses less digits than its factorization.

16438139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13884.

The product of its digits is 15552, while the sum is 35.

The square root of 16438139 is about 4054.3974891468. The cubic root of 16438139 is about 254.2636143405.

The spelling of 16438139 in words is "sixteen million, four hundred thirty-eight thousand, one hundred thirty-nine".