42503645 has 4 divisors (see below), whose sum is σ = 51004380. Its totient is φ = 34002912.

The previous prime is 42503633. The next prime is 42503749. The reversal of 42503645 is 54630524.

42503645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 16176484 + 26327161 = 4022^2 + 5131^2 .

It is a cyclic number.

It is not a de Polignac number, because 42503645 - 2⁸ = 42503389 is a prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250360 + ... + 4250369.

It is an arithmetic number, because the mean of its divisors is an integer number (12751095).

Almost surely, 2^42503645 is an apocalyptic number.

It is an amenable number.

42503645 is a deficient number, since it is larger than the sum of its proper divisors (8500735).

42503645 is an equidigital number, since it uses as much as digits as its factorization.

42503645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8500734.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 42503645 is about 6519.4819579473. The cubic root of 42503645 is about 348.9865786855.

The spelling of 42503645 in words is "forty-two million, five hundred three thousand, six hundred forty-five".