84378442 has 16 divisors (see below), whose sum is σ = 129958272. Its totient is φ = 41068800.

The previous prime is 84378407. The next prime is 84378461. The reversal of 84378442 is 24487348.

It is a junction number, because it is equal to n+sod(n) for n = 84378395 and 84378404.

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 7 ways as a sum of consecutive naturals, for example, 15817 + ... + 20467.

It is an arithmetic number, because the mean of its divisors is an integer number (8122392).

Almost surely, 2^84378442 is an apocalyptic number.

84378442 is a deficient number, since it is larger than the sum of its proper divisors (45579830).

84378442 is a wasteful number, since it uses less digits than its factorization.

84378442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4893.

The product of its digits is 172032, while the sum is 40.

The square root of 84378442 is about 9185.7738922749. The cubic root of 84378442 is about 438.6086247806.

The spelling of 84378442 in words is "eighty-four million, three hundred seventy-eight thousand, four hundred forty-two".