42007745 has 8 divisors (see below), whose sum is σ = 54287016. Its totient is φ = 31021056.

The previous prime is 42007741. The next prime is 42007751. The reversal of 42007745 is 54770024.

It can be written as a sum of positive squares in 4 ways, for example, as 5053504 + 36954241 = 2248^2 + 6079^2 .

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 42007745 - 2² = 42007741 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42007741) by changing a digit.

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, 323072 + ... + 323201.

It is an arithmetic number, because the mean of its divisors is an integer number (6785877).

Almost surely, 2^42007745 is an apocalyptic number.

It is an amenable number.

42007745 is a deficient number, since it is larger than the sum of its proper divisors (12279271).

42007745 is a wasteful number, since it uses less digits than its factorization.

42007745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646291.

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 42007745 is about 6481.3382105858. The cubic root of 42007745 is about 347.6240297043.

Adding to 42007745 its reverse (54770024), we get a palindrome (96777769).

The spelling of 42007745 in words is "forty-two million, seven thousand, seven hundred forty-five".