138836497 has 4 divisors (see below), whose sum is σ = 139756096. Its totient is φ = 137916900.

The previous prime is 138836491. The next prime is 138836539. The reversal of 138836497 is 794638831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138836497 - 2¹⁵ = 138803729 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 138836497.

It is not an unprimeable number, because it can be changed into a prime (138836491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459573 + ... + 459874.

It is an arithmetic number, because the mean of its divisors is an integer number (34939024).

Almost surely, 2^138836497 is an apocalyptic number.

It is an amenable number.

138836497 is a deficient number, since it is larger than the sum of its proper divisors (919599).

138836497 is an equidigital number, since it uses as much as digits as its factorization.

138836497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919598.

The product of its digits is 870912, while the sum is 49.

The square root of 138836497 is about 11782.8900105195. The cubic root of 138836497 is about 517.8069586239.

The spelling of 138836497 in words is "one hundred thirty-eight million, eight hundred thirty-six thousand, four hundred ninety-seven".