405688855 has 32 divisors (see below), whose sum is σ = 602058240. Its totient is φ = 258007680.

The previous prime is 405688841. The next prime is 405688889. The reversal of 405688855 is 558886504.

It is a happy number.

It is not a de Polignac number, because 405688855 - 2⁹ = 405688343 is a prime.

It is a super-2 number, since 2×405688855² = 329166894142422050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 405688799 and 405688808.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1347 + ... + 28516.

It is an arithmetic number, because the mean of its divisors is an integer number (18814320).

Almost surely, 2^405688855 is an apocalyptic number.

405688855 is a deficient number, since it is larger than the sum of its proper divisors (196369385).

405688855 is a wasteful number, since it uses less digits than its factorization.

405688855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29911.

The product of its (nonzero) digits is 1536000, while the sum is 49.

The square root of 405688855 is about 20141.7192662394. The cubic root of 405688855 is about 740.2828569269.

The spelling of 405688855 in words is "four hundred five million, six hundred eighty-eight thousand, eight hundred fifty-five".