138372438 has 8 divisors (see below), whose sum is σ = 276744888. Its totient is φ = 46124144.

The previous prime is 138372431. The next prime is 138372463. The reversal of 138372438 is 834273831.

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

138372438 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 138372396 and 138372405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138372431) 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, 11531031 + ... + 11531042.

It is an arithmetic number, because the mean of its divisors is an integer number (34593111).

Almost surely, 2^138372438 is an apocalyptic number.

138372438 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.

138372438 is a wasteful number, since it uses less digits than its factorization.

138372438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23062078.

The product of its digits is 96768, while the sum is 39.

The square root of 138372438 is about 11763.1814574119. The cubic root of 138372438 is about 517.2293938670.

The spelling of 138372438 in words is "one hundred thirty-eight million, three hundred seventy-two thousand, four hundred thirty-eight".