255405138 has 8 divisors (see below), whose sum is σ = 510810288. Its totient is φ = 85135044.

The previous prime is 255405131. The next prime is 255405211. The reversal of 255405138 is 831504552.

255405138 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.

255405138 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 255405099 and 255405108.

It is not an unprimeable number, because it can be changed into a prime (255405131) 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, 21283756 + ... + 21283767.

It is an arithmetic number, because the mean of its divisors is an integer number (63851286).

Almost surely, 2^255405138 is an apocalyptic number.

255405138 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.

255405138 is a wasteful number, since it uses less digits than its factorization.

255405138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42567528.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 255405138 is about 15981.3997509605. The cubic root of 255405138 is about 634.4682244773.

The spelling of 255405138 in words is "two hundred fifty-five million, four hundred five thousand, one hundred thirty-eight".