138047969 has 4 divisors (see below), whose sum is σ = 138104880. Its totient is φ = 137991060.

The previous prime is 138047957. The next prime is 138047983. The reversal of 138047969 is 969740831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 969740831 = 29 ⋅33439339.

It is a cyclic number.

It is not a de Polignac number, because 138047969 - 2²⁴ = 121270753 is a prime.

It is a super-2 number, since 2×138047969² = 38114483490049922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138049969) 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, 24647 + ... + 29724.

It is an arithmetic number, because the mean of its divisors is an integer number (34526220).

Almost surely, 2^138047969 is an apocalyptic number.

It is an amenable number.

138047969 is a deficient number, since it is larger than the sum of its proper divisors (56911).

138047969 is an equidigital number, since it uses as much as digits as its factorization.

138047969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56910.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 138047969 is about 11749.3816433036. The cubic root of 138047969 is about 516.8247943790.

The spelling of 138047969 in words is "one hundred thirty-eight million, forty-seven thousand, nine hundred sixty-nine".