138723161 has 8 divisors (see below), whose sum is σ = 146198400. Its totient is φ = 131265360.

The previous prime is 138723157. The next prime is 138723163. The reversal of 138723161 is 161327831.

138723161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 138723161 - 2² = 138723157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138723163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14000 + ... + 21758.

It is an arithmetic number, because the mean of its divisors is an integer number (18274800).

Almost surely, 2^138723161 is an apocalyptic number.

It is an amenable number.

138723161 is a deficient number, since it is larger than the sum of its proper divisors (7475239).

138723161 is an equidigital number, since it uses as much as digits as its factorization.

138723161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8719.

The product of its digits is 6048, while the sum is 32.

The square root of 138723161 is about 11778.0796821893. The cubic root of 138723161 is about 517.6660203092. Note that the first 3 decimals are identical.

The spelling of 138723161 in words is "one hundred thirty-eight million, seven hundred twenty-three thousand, one hundred sixty-one".