42040805 has 8 divisors (see below), whose sum is σ = 52076544. Its totient is φ = 32547600.

The previous prime is 42040777. The next prime is 42040829. The reversal of 42040805 is 50804024.

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

It is a de Polignac number, because none of the positive numbers 2^k-42040805 is a prime.

It is a Duffinian 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, 135461 + ... + 135770.

It is an arithmetic number, because the mean of its divisors is an integer number (6509568).

Almost surely, 2^42040805 is an apocalyptic number.

It is an amenable number.

42040805 is a deficient number, since it is larger than the sum of its proper divisors (10035739).

42040805 is a wasteful number, since it uses less digits than its factorization.

42040805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271267.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 42040805 is about 6483.8881082264. Note that the first 3 decimals coincide. The cubic root of 42040805 is about 347.7151988993.

Adding to 42040805 its reverse (50804024), we get a palindrome (92844829).

The spelling of 42040805 in words is "forty-two million, forty thousand, eight hundred five".