405878442 has 8 divisors (see below), whose sum is σ = 811756896. Its totient is φ = 135292812.

The previous prime is 405878423. The next prime is 405878449. The reversal of 405878442 is 244878504.

It is a sphenic number, since it is the product of 3 distinct primes.

405878442 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 405878394 and 405878403.

It is not an unprimeable number, because it can be changed into a prime (405878449) 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 3 ways as a sum of consecutive naturals, for example, 33823198 + ... + 33823209.

It is an arithmetic number, because the mean of its divisors is an integer number (101469612).

Almost surely, 2^405878442 is an apocalyptic number.

405878442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

405878442 is a wasteful number, since it uses less digits than its factorization.

405878442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67646412.

The product of its (nonzero) digits is 286720, while the sum is 42.

The square root of 405878442 is about 20146.4250426720. The cubic root of 405878442 is about 740.3981555911.

The spelling of 405878442 in words is "four hundred five million, eight hundred seventy-eight thousand, four hundred forty-two".