138438324 has 36 divisors (see below), whose sum is σ = 352052064. Its totient is φ = 45867792.

The previous prime is 138438323. The next prime is 138438347. The reversal of 138438324 is 423834831.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138438323) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5502 + ... + 17525.

It is an arithmetic number, because the mean of its divisors is an integer number (9779224).

Almost surely, 2^138438324 is an apocalyptic number.

It is an amenable number.

138438324 is an abundant number, since it is smaller than the sum of its proper divisors (213613740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138438324 is a wasteful number, since it uses less digits than its factorization.

138438324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23204 (or 23199 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 138438324 is about 11765.9816420051. The cubic root of 138438324 is about 517.3114737209.

The spelling of 138438324 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, three hundred twenty-four".