42945813 has 12 divisors (see below), whose sum is σ = 62114988. Its totient is φ = 28592640.

The previous prime is 42945811. The next prime is 42945817. The reversal of 42945813 is 31854924.

42945813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33837489 + 9108324 = 5817^2 + 3018^2 .

It is not a de Polignac number, because 42945813 - 2¹ = 42945811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42945811) 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 11 ways as a sum of consecutive naturals, for example, 5173 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (5176249).

Almost surely, 2^42945813 is an apocalyptic number.

It is an amenable number.

42945813 is a deficient number, since it is larger than the sum of its proper divisors (19169175).

42945813 is a wasteful number, since it uses less digits than its factorization.

42945813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324 (or 6321 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 42945813 is about 6553.3055018059. The cubic root of 42945813 is about 350.1925824502.

The spelling of 42945813 in words is "forty-two million, nine hundred forty-five thousand, eight hundred thirteen".