139391273 has 8 divisors (see below), whose sum is σ = 159727680. Its totient is φ = 119160720.

The previous prime is 139391269. The next prime is 139391281. The reversal of 139391273 is 372193931.

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

It is not a de Polignac number, because 139391273 - 2² = 139391269 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139391233) 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 7 ways as a sum of consecutive naturals, for example, 23618 + ... + 28923.

It is an arithmetic number, because the mean of its divisors is an integer number (19965960).

Almost surely, 2^139391273 is an apocalyptic number.

It is an amenable number.

139391273 is a deficient number, since it is larger than the sum of its proper divisors (20336407).

139391273 is an equidigital number, since it uses as much as digits as its factorization.

139391273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52927.

The product of its digits is 30618, while the sum is 38.

The square root of 139391273 is about 11806.4081328743. The cubic root of 139391273 is about 518.4957426667.

The spelling of 139391273 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, two hundred seventy-three".