42042345 has 16 divisors (see below), whose sum is σ = 70808640. Its totient is φ = 21242304.

The previous prime is 42042331. The next prime is 42042349. The reversal of 42042345 is 54324024.

It is not a de Polignac number, because 42042345 - 2⁵ = 42042313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42042349) 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 15 ways as a sum of consecutive naturals, for example, 73474 + ... + 74043.

It is an arithmetic number, because the mean of its divisors is an integer number (4425540).

Almost surely, 2^42042345 is an apocalyptic number.

It is an amenable number.

42042345 is a deficient number, since it is larger than the sum of its proper divisors (28766295).

42042345 is a wasteful number, since it uses less digits than its factorization.

42042345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147544.

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 42042345 is about 6484.0068630439. The cubic root of 42042345 is about 347.7194445750.

Adding to 42042345 its reverse (54324024), we get a palindrome (96366369).

The spelling of 42042345 in words is "forty-two million, forty-two thousand, three hundred forty-five".