255391405 has 8 divisors (see below), whose sum is σ = 313597152. Its totient is φ = 199561488.

The previous prime is 255391403. The next prime is 255391417. The reversal of 255391405 is 504193552.

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

It is a cyclic number.

It is not a de Polignac number, because 255391405 - 2¹ = 255391403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255391403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593719 + ... + 594148.

It is an arithmetic number, because the mean of its divisors is an integer number (39199644).

Almost surely, 2^255391405 is an apocalyptic number.

It is an amenable number.

255391405 is a deficient number, since it is larger than the sum of its proper divisors (58205747).

255391405 is a wasteful number, since it uses less digits than its factorization.

255391405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187915.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 255391405 is about 15980.9700894533. The cubic root of 255391405 is about 634.4568525992.

The spelling of 255391405 in words is "two hundred fifty-five million, three hundred ninety-one thousand, four hundred five".