138258797 has 4 divisors (see below), whose sum is σ = 140206176. Its totient is φ = 136311420.

The previous prime is 138258779. The next prime is 138258811. The reversal of 138258797 is 797852831.

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 138258797 - 2⁸ = 138258541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138258707) 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, 973583 + ... + 973724.

It is an arithmetic number, because the mean of its divisors is an integer number (35051544).

Almost surely, 2^138258797 is an apocalyptic number.

It is an amenable number.

138258797 is a deficient number, since it is larger than the sum of its proper divisors (1947379).

138258797 is an equidigital number, since it uses as much as digits as its factorization.

138258797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947378.

The product of its digits is 846720, while the sum is 50.

The square root of 138258797 is about 11758.3500968461. The cubic root of 138258797 is about 517.0877602567.

It can be divided in two parts, 13825 and 8797, that added together give a palindrome (22622).

The spelling of 138258797 in words is "one hundred thirty-eight million, two hundred fifty-eight thousand, seven hundred ninety-seven".