138624438 has 8 divisors (see below), whose sum is σ = 277248888. Its totient is φ = 46208144.

The previous prime is 138624413. The next prime is 138624439. The reversal of 138624438 is 834426831.

It is a happy number.

138624438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

138624438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 138624396 and 138624405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138624439) 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, 11552031 + ... + 11552042.

It is an arithmetic number, because the mean of its divisors is an integer number (34656111).

Almost surely, 2^138624438 is an apocalyptic number.

138624438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138624438 is a wasteful number, since it uses less digits than its factorization.

138624438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23104078.

The product of its digits is 110592, while the sum is 39.

The square root of 138624438 is about 11773.8879729680. The cubic root of 138624438 is about 517.5431913355.

The spelling of 138624438 in words is "one hundred thirty-eight million, six hundred twenty-four thousand, four hundred thirty-eight".