138406375 has 16 divisors (see below), whose sum is σ = 173066400. Its totient is φ = 110510400.

The previous prime is 138406369. The next prime is 138406421. The reversal of 138406375 is 573604831.

It is not a de Polignac number, because 138406375 - 2¹⁵ = 138373607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106731 + ... + 108019.

It is an arithmetic number, because the mean of its divisors is an integer number (10816650).

Almost surely, 2^138406375 is an apocalyptic number.

138406375 is a deficient number, since it is larger than the sum of its proper divisors (34660025).

138406375 is an equidigital number, since it uses as much as digits as its factorization.

138406375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163 (or 2153 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 138406375 is about 11764.6238783907. The cubic root of 138406375 is about 517.2716753583.

The spelling of 138406375 in words is "one hundred thirty-eight million, four hundred six thousand, three hundred seventy-five".