42506739 has 12 divisors (see below), whose sum is σ = 66980472. Its totient is φ = 25761600.

The previous prime is 42506731. The next prime is 42506741. The reversal of 42506739 is 93760524.

42506739 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 42506739 - 2³ = 42506731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42506731) 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, 214582 + ... + 214779.

It is an arithmetic number, because the mean of its divisors is an integer number (5581706).

Almost surely, 2^42506739 is an apocalyptic number.

42506739 is a deficient number, since it is larger than the sum of its proper divisors (24473733).

42506739 is a wasteful number, since it uses less digits than its factorization.

42506739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429378 (or 429375 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 42506739 is about 6519.7192424214. The cubic root of 42506739 is about 348.9950464947.

The spelling of 42506739 in words is "forty-two million, five hundred six thousand, seven hundred thirty-nine".