16139439 has 8 divisors (see below), whose sum is σ = 23910320. Its totient is φ = 10759608.

The previous prime is 16139423. The next prime is 16139447. The reversal of 16139439 is 93493161.

16139439 is a `hidden beast` number, since 1 + 613 + 9 + 4 + 39 = 666.

It is not a de Polignac number, because 16139439 - 2⁴ = 16139423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16139419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298852 + ... + 298905.

It is an arithmetic number, because the mean of its divisors is an integer number (2988790).

Almost surely, 2^16139439 is an apocalyptic number.

16139439 is a deficient number, since it is larger than the sum of its proper divisors (7770881).

16139439 is an equidigital number, since it uses as much as digits as its factorization.

16139439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597766 (or 597760 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 16139439 is about 4017.3920645115. The cubic root of 16139439 is about 252.7141026249.

The spelling of 16139439 in words is "sixteen million, one hundred thirty-nine thousand, four hundred thirty-nine".