16139986 has 8 divisors (see below), whose sum is σ = 24395184. Its totient is φ = 8008260.

The previous prime is 16139983. The next prime is 16139989. The reversal of 16139986 is 68993161.

It is an interprime number because it is at equal distance from previous prime (16139983) and next prime (16139989).

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

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (16139983) 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 3 ways as a sum of consecutive naturals, for example, 30540 + ... + 31063.

It is an arithmetic number, because the mean of its divisors is an integer number (3049398).

Almost surely, 2^16139986 is an apocalyptic number.

16139986 is a deficient number, since it is larger than the sum of its proper divisors (8255198).

16139986 is a wasteful number, since it uses less digits than its factorization.

16139986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61736.

The product of its digits is 69984, while the sum is 43.

The square root of 16139986 is about 4017.4601429261. The cubic root of 16139986 is about 252.7169575992.

The spelling of 16139986 in words is "sixteen million, one hundred thirty-nine thousand, nine hundred eighty-six".