138722 has 8 divisors (see below), whose sum is σ = 210000. Its totient is φ = 68724.

The previous prime is 138683. The next prime is 138727. The reversal of 138722 is 227831.

138722 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 an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138722.

It is not an unprimeable number, because it can be changed into a prime (138727) by changing a digit.

138722 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29 + ... + 527.

It is an arithmetic number, because the mean of its divisors is an integer number (26250).

2¹³⁸⁷²² is an apocalyptic number.

138722 is a deficient number, since it is larger than the sum of its proper divisors (71278).

138722 is a wasteful number, since it uses less digits than its factorization.

138722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640.

The product of its digits is 672, while the sum is 23.

The square root of 138722 is about 372.4540240083. The cubic root of 138722 is about 51.7664576157.

The spelling of 138722 in words is "one hundred thirty-eight thousand, seven hundred twenty-two".