405215055 has 80 divisors (see below), whose sum is σ = 847387200. Its totient is φ = 185177664.

The previous prime is 405215053. The next prime is 405215089. The reversal of 405215055 is 550512504.

405215055 is a `hidden beast` number, since 40 + 521 + 50 + 55 = 666.

It is not a de Polignac number, because 405215055 - 2¹ = 405215053 is a prime.

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 (405215053) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 137457 + ... + 140373.

It is an arithmetic number, because the mean of its divisors is an integer number (10592340).

Almost surely, 2^405215055 is an apocalyptic number.

405215055 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

405215055 is an abundant number, since it is smaller than the sum of its proper divisors (442172145).

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

405215055 is an equidigital number, since it uses as much as digits as its factorization.

405215055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955 (or 2932 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 405215055 is about 20129.9541728241. The cubic root of 405215055 is about 739.9945549879.

Adding to 405215055 its reverse (550512504), we get a palindrome (955727559).

The spelling of 405215055 in words is "four hundred five million, two hundred fifteen thousand, fifty-five".