42978305 has 8 divisors (see below), whose sum is σ = 51921000. Its totient is φ = 34151296.

The previous prime is 42978251. The next prime is 42978311. The reversal of 42978305 is 50387924.

It can be written as a sum of positive squares in 4 ways, for example, as 350464 + 42627841 = 592^2 + 6529^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42978305 - 2⁶ = 42978241 is a prime.

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, 28100 + ... + 29589.

It is an arithmetic number, because the mean of its divisors is an integer number (6490125).

Almost surely, 2^42978305 is an apocalyptic number.

It is an amenable number.

42978305 is a deficient number, since it is larger than the sum of its proper divisors (8942695).

42978305 is a wasteful number, since it uses less digits than its factorization.

42978305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57843.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 42978305 is about 6555.7840873537. The cubic root of 42978305 is about 350.2808765758.

The spelling of 42978305 in words is "forty-two million, nine hundred seventy-eight thousand, three hundred five".