42105445 has 8 divisors (see below), whose sum is σ = 51892344. Its totient is φ = 32773824.

The previous prime is 42105407. The next prime is 42105449. The reversal of 42105445 is 54450124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4761124 + 37344321 = 2182^2 + 6111^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42105445 - 2⁷ = 42105317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42105449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113614 + ... + 113983.

It is an arithmetic number, because the mean of its divisors is an integer number (6486543).

Almost surely, 2^42105445 is an apocalyptic number.

It is an amenable number.

42105445 is a deficient number, since it is larger than the sum of its proper divisors (9786899).

42105445 is a wasteful number, since it uses less digits than its factorization.

42105445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227639.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 42105445 is about 6488.8708570906. The cubic root of 42105445 is about 347.8933179179.

Adding to 42105445 its reverse (54450124), we get a palindrome (96555569).

The spelling of 42105445 in words is "forty-two million, one hundred five thousand, four hundred forty-five".