255138238 has 4 divisors (see below), whose sum is σ = 382707360. Its totient is φ = 127569118.

The previous prime is 255138197. The next prime is 255138283. The reversal of 255138238 is 832831552.

255138238 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 255138197 and 255138206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63784558 + ... + 63784561.

It is an arithmetic number, because the mean of its divisors is an integer number (95676840).

Almost surely, 2^255138238 is an apocalyptic number.

255138238 is a deficient number, since it is larger than the sum of its proper divisors (127569122).

255138238 is a wasteful number, since it uses less digits than its factorization.

255138238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127569121.

The product of its digits is 57600, while the sum is 37.

The square root of 255138238 is about 15973.0472358908. The cubic root of 255138238 is about 634.2471396658.

The spelling of 255138238 in words is "two hundred fifty-five million, one hundred thirty-eight thousand, two hundred thirty-eight".