405804378 has 48 divisors (see below), whose sum is σ = 946940544. Its totient is φ = 115597440.

The previous prime is 405804359. The next prime is 405804389. The reversal of 405804378 is 873408504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106018 + ... + 109778.

It is an arithmetic number, because the mean of its divisors is an integer number (19727928).

Almost surely, 2^405804378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405804378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (473470272).

405804378 is an abundant number, since it is smaller than the sum of its proper divisors (541136166).

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

405804378 is a wasteful number, since it uses less digits than its factorization.

405804378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147 (or 4140 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 39.

The square root of 405804378 is about 20144.5868163137. The cubic root of 405804378 is about 740.3531173241.

The spelling of 405804378 in words is "four hundred five million, eight hundred four thousand, three hundred seventy-eight".