138442234 has 32 divisors (see below), whose sum is σ = 247443840. Its totient is φ = 56852928.

The previous prime is 138442231. The next prime is 138442253. The reversal of 138442234 is 432244831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138442196 and 138442205.

It is not an unprimeable number, because it can be changed into a prime (138442231) 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 15 ways as a sum of consecutive naturals, for example, 32712 + ... + 36700.

It is an arithmetic number, because the mean of its divisors is an integer number (7732620).

Almost surely, 2^138442234 is an apocalyptic number.

138442234 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138442234 is a deficient number, since it is larger than the sum of its proper divisors (109001606).

138442234 is a wasteful number, since it uses less digits than its factorization.

138442234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102.

The product of its digits is 18432, while the sum is 31.

The square root of 138442234 is about 11766.1477978139. The cubic root of 138442234 is about 517.3163439253.

The spelling of 138442234 in words is "one hundred thirty-eight million, four hundred forty-two thousand, two hundred thirty-four".