405404478 has 24 divisors (see below), whose sum is σ = 890411808. Its totient is φ = 133283232.

The previous prime is 405404459. The next prime is 405404479. The reversal of 405404478 is 874404504.

405404478 is a `hidden beast` number, since 4 + 0 + 540 + 44 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405404479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152950 + ... + 155577.

It is an arithmetic number, because the mean of its divisors is an integer number (37100492).

Almost surely, 2^405404478 is an apocalyptic number.

405404478 is an abundant number, since it is smaller than the sum of its proper divisors (485007330).

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

405404478 is a wasteful number, since it uses less digits than its factorization.

405404478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308608 (or 308605 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 36.

The square root of 405404478 is about 20134.6586263587. The cubic root of 405404478 is about 740.1098436894.

The spelling of 405404478 in words is "four hundred five million, four hundred four thousand, four hundred seventy-eight".