42909005 has 8 divisors (see below), whose sum is σ = 51621624. Its totient is φ = 34240000.

The previous prime is 42908963. The next prime is 42909019. The reversal of 42909005 is 50090924.

It can be written as a sum of positive squares in 4 ways, for example, as 10259209 + 32649796 = 3203^2 + 5714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42909005 - 2¹² = 42904909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8696 + ... + 12705.

It is an arithmetic number, because the mean of its divisors is an integer number (6452703).

Almost surely, 2^42909005 is an apocalyptic number.

It is an amenable number.

42909005 is a deficient number, since it is larger than the sum of its proper divisors (8712619).

42909005 is a wasteful number, since it uses less digits than its factorization.

42909005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21807.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 42909005 is about 6550.4965460643. The cubic root of 42909005 is about 350.0925061604.

Adding to 42909005 its reverse (50090924), we get a palindrome (92999929).

The spelling of 42909005 in words is "forty-two million, nine hundred nine thousand, five".