16139785 has 4 divisors (see below), whose sum is σ = 19367748. Its totient is φ = 12911824.

The previous prime is 16139777. The next prime is 16139803. The reversal of 16139785 is 58793161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10394176 + 5745609 = 3224^2 + 2397^2 .

It is a cyclic number.

It is not a de Polignac number, because 16139785 - 2³ = 16139777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 1613974 + ... + 1613983.

It is an arithmetic number, because the mean of its divisors is an integer number (4841937).

Almost surely, 2^16139785 is an apocalyptic number.

It is an amenable number.

16139785 is a deficient number, since it is larger than the sum of its proper divisors (3227963).

16139785 is an equidigital number, since it uses as much as digits as its factorization.

16139785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227962.

The product of its digits is 45360, while the sum is 40.

The square root of 16139785 is about 4017.4351270431. The cubic root of 16139785 is about 252.7159085211.

The spelling of 16139785 in words is "sixteen million, one hundred thirty-nine thousand, seven hundred eighty-five".