138442235 has 4 divisors (see below), whose sum is σ = 166130688. Its totient is φ = 110753784.

The previous prime is 138442231. The next prime is 138442253. The reversal of 138442235 is 532244831.

138442235 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 532244831 = 89 ⋅5980279.

It is a cyclic number.

It is not a de Polignac number, because 138442235 - 2² = 138442231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138442231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13844219 + ... + 13844228.

It is an arithmetic number, because the mean of its divisors is an integer number (41532672).

Almost surely, 2^138442235 is an apocalyptic number.

138442235 is a deficient number, since it is larger than the sum of its proper divisors (27688453).

138442235 is an equidigital number, since it uses as much as digits as its factorization.

138442235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27688452.

The product of its digits is 23040, while the sum is 32.

The square root of 138442235 is about 11766.1478403087. The cubic root of 138442235 is about 517.3163451709.

The spelling of 138442235 in words is "one hundred thirty-eight million, four hundred forty-two thousand, two hundred thirty-five".