139163945 has 16 divisors (see below), whose sum is σ = 170995968. Its totient is φ = 108677760.

The previous prime is 139163909. The next prime is 139163971. The reversal of 139163945 is 549361931.

It is a de Polignac number, because none of the positive numbers 2^k-139163945 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 161957 + ... + 162813.

It is an arithmetic number, because the mean of its divisors is an integer number (10687248).

Almost surely, 2^139163945 is an apocalyptic number.

It is an amenable number.

139163945 is a deficient number, since it is larger than the sum of its proper divisors (31832023).

139163945 is an equidigital number, since it uses as much as digits as its factorization.

139163945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600.

The product of its digits is 87480, while the sum is 41.

The square root of 139163945 is about 11796.7768903205. The cubic root of 139163945 is about 518.2137242122.

The spelling of 139163945 in words is "one hundred thirty-nine million, one hundred sixty-three thousand, nine hundred forty-five".