138137869 has 4 divisors (see below), whose sum is σ = 146263644. Its totient is φ = 130012096.

The previous prime is 138137861. The next prime is 138137873. The reversal of 138137869 is 968731831.

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 88266025 + 49871844 = 9395^2 + 7062^2 .

It is a cyclic number.

It is not a de Polignac number, because 138137869 - 2³ = 138137861 is a prime.

It is a super-2 number, since 2×138137869² = 38164141703722322, 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 (138137861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4062862 + ... + 4062895.

It is an arithmetic number, because the mean of its divisors is an integer number (36565911).

Almost surely, 2^138137869 is an apocalyptic number.

It is an amenable number.

138137869 is a deficient number, since it is larger than the sum of its proper divisors (8125775).

138137869 is an equidigital number, since it uses as much as digits as its factorization.

138137869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8125774.

The product of its digits is 217728, while the sum is 46.

The square root of 138137869 is about 11753.2067539034. The cubic root of 138137869 is about 516.9369594165.

The spelling of 138137869 in words is "one hundred thirty-eight million, one hundred thirty-seven thousand, eight hundred sixty-nine".