138738497 has 4 divisors (see below), whose sum is σ = 139239636. Its totient is φ = 138237360.

The previous prime is 138738463. The next prime is 138738503. The reversal of 138738497 is 794837831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794837831 = 1747 ⋅454973.

It can be written as a sum of positive squares in 2 ways, for example, as 10233601 + 128504896 = 3199^2 + 11336^2 .

It is a cyclic number.

It is not a de Polignac number, because 138738497 - 2²⁰ = 137689921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138738097) 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, 250154 + ... + 250707.

It is an arithmetic number, because the mean of its divisors is an integer number (34809909).

Almost surely, 2^138738497 is an apocalyptic number.

It is an amenable number.

138738497 is a deficient number, since it is larger than the sum of its proper divisors (501139).

138738497 is an equidigital number, since it uses as much as digits as its factorization.

138738497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501138.

The product of its digits is 1016064, while the sum is 50.

The square root of 138738497 is about 11778.7307041124. The cubic root of 138738497 is about 517.6850957913.

The spelling of 138738497 in words is "one hundred thirty-eight million, seven hundred thirty-eight thousand, four hundred ninety-seven".