16139556 has 18 divisors (see below), whose sum is σ = 40797302. Its totient is φ = 5379840.

The previous prime is 16139503. The next prime is 16139581. The reversal of 16139556 is 65593161.

It can be written as a sum of positive squares in only one way, i.e., 14699556 + 1440000 = 3834^2 + 1200^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 448321 = 16139556 / (1 + 6 + 1 + 3 + 9 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 16139556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224125 + ... + 224196.

Almost surely, 2^16139556 is an apocalyptic number.

It is an amenable number.

16139556 is an abundant number, since it is smaller than the sum of its proper divisors (24657746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16139556 is a wasteful number, since it uses less digits than its factorization.

16139556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448331 (or 448326 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 16139556 is about 4017.4066261707. The cubic root of 16139556 is about 252.7147132921.

The spelling of 16139556 in words is "sixteen million, one hundred thirty-nine thousand, five hundred fifty-six".