42031009 has 8 divisors (see below), whose sum is σ = 43463168. Its totient is φ = 40603680.

The previous prime is 42030971. The next prime is 42031039. The reversal of 42031009 is 90013024.

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 42031009 - 2⁷ = 42030881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42031039) 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, 28324 + ... + 29770.

It is an arithmetic number, because the mean of its divisors is an integer number (5432896).

Almost surely, 2^42031009 is an apocalyptic number.

It is an amenable number.

42031009 is a deficient number, since it is larger than the sum of its proper divisors (1432159).

42031009 is a wasteful number, since it uses less digits than its factorization.

42031009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 42031009 is about 6483.1326532780. The cubic root of 42031009 is about 347.6881895633.

The spelling of 42031009 in words is "forty-two million, thirty-one thousand, nine".