16139505 has 16 divisors (see below), whose sum is σ = 25905600. Its totient is φ = 8580288.

The previous prime is 16139503. The next prime is 16139581. The reversal of 16139505 is 50593161.

It is not a de Polignac number, because 16139505 - 2¹ = 16139503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16139503) 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 in 15 ways as a sum of consecutive naturals, for example, 3694 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (1619100).

Almost surely, 2^16139505 is an apocalyptic number.

16139505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16139505 is a deficient number, since it is larger than the sum of its proper divisors (9766095).

16139505 is a wasteful number, since it uses less digits than its factorization.

16139505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 16139505 is about 4017.4002787873. The cubic root of 16139505 is about 252.7144471042.

The spelling of 16139505 in words is "sixteen million, one hundred thirty-nine thousand, five hundred five".