255381387 has 4 divisors (see below), whose sum is σ = 340508520. Its totient is φ = 170254256.

The previous prime is 255381383. The next prime is 255381431. The reversal of 255381387 is 783183552.

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

It is a cyclic number.

It is not a de Polignac number, because 255381387 - 2² = 255381383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255381383) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 42563562 + ... + 42563567.

It is an arithmetic number, because the mean of its divisors is an integer number (85127130).

Almost surely, 2^255381387 is an apocalyptic number.

255381387 is a deficient number, since it is larger than the sum of its proper divisors (85127133).

255381387 is an equidigital number, since it uses as much as digits as its factorization.

255381387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85127132.

The product of its digits is 201600, while the sum is 42.

The square root of 255381387 is about 15980.6566510892. The cubic root of 255381387 is about 634.4485567420.

The spelling of 255381387 in words is "two hundred fifty-five million, three hundred eighty-one thousand, three hundred eighty-seven".