255404420 has 48 divisors (see below), whose sum is σ = 563528448. Its totient is φ = 97046400.

The previous prime is 255404417. The next prime is 255404423. The reversal of 255404420 is 24404552.

It is an interprime number because it is at equal distance from previous prime (255404417) and next prime (255404423).

It is a self number, because there is not a number n which added to its sum of digits gives 255404420.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67622 + ... + 71298.

It is an arithmetic number, because the mean of its divisors is an integer number (11740176).

Almost surely, 2^255404420 is an apocalyptic number.

255404420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255404420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281764224).

255404420 is an abundant number, since it is smaller than the sum of its proper divisors (308124028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255404420 is a wasteful number, since it uses less digits than its factorization.

255404420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3860 (or 3858 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 255404420 is about 15981.3772873304. The cubic root of 255404420 is about 634.4676299335.

Adding to 255404420 its reverse (24404552), we get a palindrome (279808972).

The spelling of 255404420 in words is "two hundred fifty-five million, four hundred four thousand, four hundred twenty".