138137269 has 4 divisors (see below), whose sum is σ = 138792160. Its totient is φ = 137482380.

The previous prime is 138137221. The next prime is 138137297. The reversal of 138137269 is 962731831.

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 138137269 - 2⁷ = 138137141 is a prime.

It is a super-2 number, since 2×138137269² = 38163810173556722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138137369) 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, 327129 + ... + 327550.

It is an arithmetic number, because the mean of its divisors is an integer number (34698040).

Almost surely, 2^138137269 is an apocalyptic number.

It is an amenable number.

138137269 is a deficient number, since it is larger than the sum of its proper divisors (654891).

138137269 is an equidigital number, since it uses as much as digits as its factorization.

138137269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654890.

The product of its digits is 54432, while the sum is 40.

The square root of 138137269 is about 11753.1812289269. The cubic root of 138137269 is about 516.9362109791.

The spelling of 138137269 in words is "one hundred thirty-eight million, one hundred thirty-seven thousand, two hundred sixty-nine".