138406255 has 32 divisors (see below), whose sum is σ = 184863168. Its totient is φ = 98841600.

The previous prime is 138406253. The next prime is 138406277. The reversal of 138406255 is 552604831.

It is not a de Polignac number, because 138406255 - 2¹ = 138406253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138406255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138406253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265395 + ... + 265915.

It is an arithmetic number, because the mean of its divisors is an integer number (5776974).

Almost surely, 2^138406255 is an apocalyptic number.

138406255 is a deficient number, since it is larger than the sum of its proper divisors (46456913).

138406255 is a wasteful number, since it uses less digits than its factorization.

138406255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 138406255 is about 11764.6187783540. The cubic root of 138406255 is about 517.2715258646.

The spelling of 138406255 in words is "one hundred thirty-eight million, four hundred six thousand, two hundred fifty-five".