138429722 has 4 divisors (see below), whose sum is σ = 207644586. Its totient is φ = 69214860.

The previous prime is 138429721. The next prime is 138429737. The reversal of 138429722 is 227924831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227924831 = 17 ⋅13407343.

It can be written as a sum of positive squares in only one way, i.e., 117917881 + 20511841 = 10859^2 + 4529^2 .

It is not an unprimeable number, because it can be changed into a prime (138429721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34607429 + ... + 34607432.

Almost surely, 2^138429722 is an apocalyptic number.

138429722 is a deficient number, since it is larger than the sum of its proper divisors (69214864).

138429722 is an equidigital number, since it uses as much as digits as its factorization.

138429722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69214863.

The product of its digits is 48384, while the sum is 38.

The square root of 138429722 is about 11765.6160909661. The cubic root of 138429722 is about 517.3007589483.

The spelling of 138429722 in words is "one hundred thirty-eight million, four hundred twenty-nine thousand, seven hundred twenty-two".