16815139 has 8 divisors (see below), whose sum is σ = 19141632. Its totient is φ = 14621640.

The previous prime is 16815137. The next prime is 16815173. The reversal of 16815139 is 93151861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16815139 - 2¹ = 16815137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16815137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32979 + ... + 33484.

It is an arithmetic number, because the mean of its divisors is an integer number (2392704).

Almost surely, 2^16815139 is an apocalyptic number.

16815139 is a deficient number, since it is larger than the sum of its proper divisors (2326493).

16815139 is a wasteful number, since it uses less digits than its factorization.

16815139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66497.

The product of its digits is 6480, while the sum is 34.

The square root of 16815139 is about 4100.6266594266. The cubic root of 16815139 is about 256.1927412022.

The spelling of 16815139 in words is "sixteen million, eight hundred fifteen thousand, one hundred thirty-nine".