42978945 has 16 divisors (see below), whose sum is σ = 68870592. Its totient is φ = 22887360.

The previous prime is 42978917. The next prime is 42978961. The reversal of 42978945 is 54987924.

42978945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42978945 - 2¹² = 42974849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42978894 and 42978903.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10399 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (4304412).

Almost surely, 2^42978945 is an apocalyptic number.

It is an amenable number.

42978945 is a deficient number, since it is larger than the sum of its proper divisors (25891647).

42978945 is a wasteful number, since it uses less digits than its factorization.

42978945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352.

The product of its digits is 725760, while the sum is 48.

The square root of 42978945 is about 6555.8328990297. The cubic root of 42978945 is about 350.2826152720.

The spelling of 42978945 in words is "forty-two million, nine hundred seventy-eight thousand, nine hundred forty-five".