138155357 has 4 divisors (see below), whose sum is σ = 138326940. Its totient is φ = 137983776.

The previous prime is 138155341. The next prime is 138155359. The reversal of 138155357 is 753551831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753551831 = 1669 ⋅451499.

It can be written as a sum of positive squares in 2 ways, for example, as 95043001 + 43112356 = 9749^2 + 6566^2 .

It is a cyclic number.

It is not a de Polignac number, because 138155357 - 2⁴ = 138155341 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 138155357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138155359) 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 3 ways as a sum of consecutive naturals, for example, 84578 + ... + 86195.

It is an arithmetic number, because the mean of its divisors is an integer number (34581735).

Almost surely, 2^138155357 is an apocalyptic number.

It is an amenable number.

138155357 is a deficient number, since it is larger than the sum of its proper divisors (171583).

138155357 is an equidigital number, since it uses as much as digits as its factorization.

138155357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171582.

The product of its digits is 63000, while the sum is 38.

The square root of 138155357 is about 11753.9506975314. The cubic root of 138155357 is about 516.9587729185.

The spelling of 138155357 in words is "one hundred thirty-eight million, one hundred fifty-five thousand, three hundred fifty-seven".