42006641 has 4 divisors (see below), whose sum is σ = 42069732. Its totient is φ = 41943552.

The previous prime is 42006631. The next prime is 42006659. The reversal of 42006641 is 14660024.

It is a happy number.

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 4857616 + 37149025 = 2204^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 42006641 - 2¹⁰ = 42005617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42006611) 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, 30536 + ... + 31881.

It is an arithmetic number, because the mean of its divisors is an integer number (10517433).

Almost surely, 2^42006641 is an apocalyptic number.

It is an amenable number.

42006641 is a deficient number, since it is larger than the sum of its proper divisors (63091).

42006641 is an equidigital number, since it uses as much as digits as its factorization.

42006641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63090.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 42006641 is about 6481.2530424294. The cubic root of 42006641 is about 347.6209843905.

Adding to 42006641 its reverse (14660024), we get a palindrome (56666665).

The spelling of 42006641 in words is "forty-two million, six thousand, six hundred forty-one".