42505345 has 16 divisors (see below), whose sum is σ = 52262352. Its totient is φ = 33177600.

The previous prime is 42505327. The next prime is 42505363. The reversal of 42505345 is 54350524.

It is an interprime number because it is at equal distance from previous prime (42505327) and next prime (42505363).

It can be written as a sum of positive squares in 8 ways, for example, as 6780816 + 35724529 = 2604^2 + 5977^2 .

It is not a de Polignac number, because 42505345 - 2¹⁹ = 41981057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36289 + ... + 37441.

It is an arithmetic number, because the mean of its divisors is an integer number (3266397).

Almost surely, 2^42505345 is an apocalyptic number.

It is an amenable number.

42505345 is a deficient number, since it is larger than the sum of its proper divisors (9757007).

42505345 is a wasteful number, since it uses less digits than its factorization.

42505345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 42505345 is about 6519.6123351009. The cubic root of 42505345 is about 348.9912313788.

Adding to 42505345 its reverse (54350524), we get a palindrome (96855869).

The spelling of 42505345 in words is "forty-two million, five hundred five thousand, three hundred forty-five".