139057 has 4 divisors (see below), whose sum is σ = 139876. Its totient is φ = 138240.

The previous prime is 139033. The next prime is 139067. The reversal of 139057 is 750931.

139057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 750931 = 157 ⋅4783.

It can be written as a sum of positive squares in 2 ways, for example, as 126736 + 12321 = 356^2 + 111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (34969).

2¹³⁹⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

139057 is a deficient number, since it is larger than the sum of its proper divisors (819).

139057 is an equidigital number, since it uses as much as digits as its factorization.

139057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818.

The product of its (nonzero) digits is 945, while the sum is 25.

The square root of 139057 is about 372.9034727647. The cubic root of 139057 is about 51.8080944204.

Adding to 139057 its reverse (750931), we get a palindrome (889988).

The spelling of 139057 in words is "one hundred thirty-nine thousand, fifty-seven".