42339945 has 24 divisors (see below), whose sum is σ = 71970624. Its totient is φ = 21250816.

The previous prime is 42339943. The next prime is 42339949. The reversal of 42339945 is 54993324.

It is not a de Polignac number, because 42339945 - 2¹ = 42339943 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42339943) 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 23 ways as a sum of consecutive naturals, for example, 549 + ... + 9218.

It is an arithmetic number, because the mean of its divisors is an integer number (2998776).

Almost surely, 2^42339945 is an apocalyptic number.

It is an amenable number.

42339945 is a deficient number, since it is larger than the sum of its proper divisors (29630679).

42339945 is a wasteful number, since it uses less digits than its factorization.

42339945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9809 (or 9792 counting only the distinct ones).

The product of its digits is 116640, while the sum is 39.

The square root of 42339945 is about 6506.9151677273. The cubic root of 42339945 is about 348.5379692916.

The spelling of 42339945 in words is "forty-two million, three hundred thirty-nine thousand, nine hundred forty-five".