138626057 has 4 divisors (see below), whose sum is σ = 139165716. Its totient is φ = 138086400.

The previous prime is 138626029. The next prime is 138626063. The reversal of 138626057 is 750626831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750626831 = 1789 ⋅419579.

It can be written as a sum of positive squares in 2 ways, for example, as 101525776 + 37100281 = 10076^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 138626057 - 2¹⁰ = 138625033 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 138626057.

It is not an unprimeable number, because it can be changed into a prime (138626357) 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, 269444 + ... + 269957.

It is an arithmetic number, because the mean of its divisors is an integer number (34791429).

Almost surely, 2^138626057 is an apocalyptic number.

It is an amenable number.

138626057 is a deficient number, since it is larger than the sum of its proper divisors (539659).

138626057 is an equidigital number, since it uses as much as digits as its factorization.

138626057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539658.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 138626057 is about 11773.9567266064. The cubic root of 138626057 is about 517.5452061297.

The spelling of 138626057 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, fifty-seven".