42040001 has 4 divisors (see below), whose sum is σ = 42081732. Its totient is φ = 41998272.

The previous prime is 42039967. The next prime is 42040007. The reversal of 42040001 is 10004024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19009600 + 23030401 = 4360^2 + 4799^2 .

It is a cyclic number.

It is not a de Polignac number, because 42040001 - 2¹⁴ = 42023617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42040007) 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 3 ways as a sum of consecutive naturals, for example, 19316 + ... + 21381.

It is an arithmetic number, because the mean of its divisors is an integer number (10520433).

Almost surely, 2^42040001 is an apocalyptic number.

It is an amenable number.

42040001 is a deficient number, since it is larger than the sum of its proper divisors (41731).

42040001 is a wasteful number, since it uses less digits than its factorization.

42040001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41730.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 42040001 is about 6483.8261080939. The cubic root of 42040001 is about 347.7129822846.

Adding to 42040001 its reverse (10004024), we get a palindrome (52044025).

The spelling of 42040001 in words is "forty-two million, forty thousand, one".