138442232 has 8 divisors (see below), whose sum is σ = 259579200. Its totient is φ = 69221112.

The previous prime is 138442231. The next prime is 138442253. The reversal of 138442232 is 232244831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×138442232³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 138442195 and 138442204.

It is a congruent 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 as a sum of consecutive naturals, namely, 8652632 + ... + 8652647.

It is an arithmetic number, because the mean of its divisors is an integer number (32447400).

Almost surely, 2^138442232 is an apocalyptic number.

It is an amenable number.

138442232 is a deficient number, since it is larger than the sum of its proper divisors (121136968).

138442232 is a wasteful number, since it uses less digits than its factorization.

138442232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17305285 (or 17305281 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 138442232 is about 11766.1477128243. The cubic root of 138442232 is about 517.3163414342.

The spelling of 138442232 in words is "one hundred thirty-eight million, four hundred forty-two thousand, two hundred thirty-two".