42406539 has 16 divisors (see below), whose sum is σ = 64960512. Its totient is φ = 24104448.

The previous prime is 42406531. The next prime is 42406541. The reversal of 42406539 is 93560424.

It is not a de Polignac number, because 42406539 - 2³ = 42406531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42406531) 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, 1179 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (4060032).

Almost surely, 2^42406539 is an apocalyptic number.

42406539 is a deficient number, since it is larger than the sum of its proper divisors (22553973).

42406539 is a wasteful number, since it uses less digits than its factorization.

42406539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 42406539 is about 6512.0303285535. The cubic root of 42406539 is about 348.7206051714.

The spelling of 42406539 in words is "forty-two million, four hundred six thousand, five hundred thirty-nine".