255243138 has 8 divisors (see below), whose sum is σ = 510486288. Its totient is φ = 85081044.

The previous prime is 255243101. The next prime is 255243139. The reversal of 255243138 is 831342552.

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

255243138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 255243099 and 255243108.

It is not an unprimeable number, because it can be changed into a prime (255243139) 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, 21270256 + ... + 21270267.

It is an arithmetic number, because the mean of its divisors is an integer number (63810786).

Almost surely, 2^255243138 is an apocalyptic number.

255243138 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.

255243138 is a wasteful number, since it uses less digits than its factorization.

255243138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42540528.

The product of its digits is 28800, while the sum is 33.

The square root of 255243138 is about 15976.3305549178. The cubic root of 255243138 is about 634.3340512544.

The spelling of 255243138 in words is "two hundred fifty-five million, two hundred forty-three thousand, one hundred thirty-eight".