139986163 has 4 divisors (see below), whose sum is σ = 142964640. Its totient is φ = 137007688.

The previous prime is 139986151. The next prime is 139986179. The reversal of 139986163 is 361689931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 361689931 = 4603 ⋅78577.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139986163 is a prime.

It is a super-2 number, since 2×139986163² = 39192251662925138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139986263) by changing a digit.

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, 1489168 + ... + 1489261.

It is an arithmetic number, because the mean of its divisors is an integer number (35741160).

Almost surely, 2^139986163 is an apocalyptic number.

139986163 is a deficient number, since it is larger than the sum of its proper divisors (2978477).

139986163 is an equidigital number, since it uses as much as digits as its factorization.

139986163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978476.

The product of its digits is 209952, while the sum is 46.

The square root of 139986163 is about 11831.5748317796. The cubic root of 139986163 is about 519.2323028260.

The spelling of 139986163 in words is "one hundred thirty-nine million, nine hundred eighty-six thousand, one hundred sixty-three".