139028873 has 4 divisors (see below), whose sum is σ = 147207060. Its totient is φ = 130850688.

The previous prime is 139028849. The next prime is 139028887. The reversal of 139028873 is 378820931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 378820931 = 6481 ⋅58451.

It can be written as a sum of positive squares in 2 ways, for example, as 120736144 + 18292729 = 10988^2 + 4277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139028873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139028873.

It is not an unprimeable number, because it can be changed into a prime (139021873) 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, 4089068 + ... + 4089101.

It is an arithmetic number, because the mean of its divisors is an integer number (36801765).

Almost surely, 2^139028873 is an apocalyptic number.

It is an amenable number.

139028873 is a deficient number, since it is larger than the sum of its proper divisors (8178187).

139028873 is an equidigital number, since it uses as much as digits as its factorization.

139028873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178186.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 139028873 is about 11791.0505469190. The cubic root of 139028873 is about 518.0460111781.

The spelling of 139028873 in words is "one hundred thirty-nine million, twenty-eight thousand, eight hundred seventy-three".