138530869 has 4 divisors (see below), whose sum is σ = 140482080. Its totient is φ = 136579660.

The previous prime is 138530857. The next prime is 138530891. The reversal of 138530869 is 968035831.

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 138530869 - 2⁵ = 138530837 is a prime.

It is a super-2 number, since 2×138530869² = 38381603331790322, 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 (138530809) 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, 975499 + ... + 975640.

It is an arithmetic number, because the mean of its divisors is an integer number (35120520).

Almost surely, 2^138530869 is an apocalyptic number.

It is an amenable number.

138530869 is a deficient number, since it is larger than the sum of its proper divisors (1951211).

138530869 is an equidigital number, since it uses as much as digits as its factorization.

138530869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951210.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 138530869 is about 11769.9137210092. The cubic root of 138530869 is about 517.4267210141.

The spelling of 138530869 in words is "one hundred thirty-eight million, five hundred thirty thousand, eight hundred sixty-nine".