138203137 has 4 divisors (see below), whose sum is σ = 138776836. Its totient is φ = 137629440.

The previous prime is 138203083. The next prime is 138203141. The reversal of 138203137 is 731302831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89189136 + 49014001 = 9444^2 + 7001^2 .

It is a cyclic number.

It is not a de Polignac number, because 138203137 - 2²⁷ = 3985409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138203147) 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, 286488 + ... + 286969.

It is an arithmetic number, because the mean of its divisors is an integer number (34694209).

Almost surely, 2^138203137 is an apocalyptic number.

It is an amenable number.

138203137 is a deficient number, since it is larger than the sum of its proper divisors (573699).

138203137 is an equidigital number, since it uses as much as digits as its factorization.

138203137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573698.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 138203137 is about 11755.9830299299. The cubic root of 138203137 is about 517.0183614952.

Adding to 138203137 its reverse (731302831), we get a palindrome (869505968).

The spelling of 138203137 in words is "one hundred thirty-eight million, two hundred three thousand, one hundred thirty-seven".