138172069 has 8 divisors (see below), whose sum is σ = 158794560. Its totient is φ = 117770496.

The previous prime is 138172051. The next prime is 138172081. The reversal of 138172069 is 960271831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138172069 is a prime.

It is a super-2 number, since 2×138172069² = 38183041303481522, 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 (138172019) 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 7 ways as a sum of consecutive naturals, for example, 53884 + ... + 56389.

It is an arithmetic number, because the mean of its divisors is an integer number (19849320).

Almost surely, 2^138172069 is an apocalyptic number.

It is an amenable number.

138172069 is a deficient number, since it is larger than the sum of its proper divisors (20622491).

138172069 is a wasteful number, since it uses less digits than its factorization.

138172069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110459.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 138172069 is about 11754.6615859411. The cubic root of 138172069 is about 516.9796167639.

The spelling of 138172069 in words is "one hundred thirty-eight million, one hundred seventy-two thousand, sixty-nine".