255404421 has 32 divisors (see below), whose sum is σ = 396355200. Its totient is φ = 164357424.

The previous prime is 255404417. The next prime is 255404423. The reversal of 255404421 is 124404552.

255404421 is a `hidden beast` number, since 255 + 404 + 4 + 2 + 1 = 666.

255404421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 255404421 - 2² = 255404417 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255404423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61410 + ... + 65436.

It is an arithmetic number, because the mean of its divisors is an integer number (12386100).

Almost surely, 2^255404421 is an apocalyptic number.

It is an amenable number.

255404421 is a deficient number, since it is larger than the sum of its proper divisors (140950779).

255404421 is an frugal number, since it uses more digits than its factorization.

255404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077 (or 4059 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 255404421 is about 15981.3773186168. The cubic root of 255404421 is about 634.4676307616.

Adding to 255404421 its reverse (124404552), we get a palindrome (379808973).

The spelling of 255404421 in words is "two hundred fifty-five million, four hundred four thousand, four hundred twenty-one".