42041645 has 4 divisors (see below), whose sum is σ = 50449980. Its totient is φ = 33633312.

The previous prime is 42041639. The next prime is 42041647. The reversal of 42041645 is 54614024.

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 5885476 + 36156169 = 2426^2 + 6013^2 .

It is a cyclic number.

It is not a de Polignac number, because 42041645 - 2⁶ = 42041581 is a prime.

It is a super-3 number, since 3×42041645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42041647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4204160 + ... + 4204169.

It is an arithmetic number, because the mean of its divisors is an integer number (12612495).

Almost surely, 2^42041645 is an apocalyptic number.

It is an amenable number.

42041645 is a deficient number, since it is larger than the sum of its proper divisors (8408335).

42041645 is an equidigital number, since it uses as much as digits as its factorization.

42041645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408334.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 42041645 is about 6483.9528838510. The cubic root of 42041645 is about 347.7175147353.

Adding to 42041645 its reverse (54614024), we get a palindrome (96655669).

The spelling of 42041645 in words is "forty-two million, forty-one thousand, six hundred forty-five".