42645205 has 4 divisors (see below), whose sum is σ = 51174252. Its totient is φ = 34116160.

The previous prime is 42645199. The next prime is 42645217. The reversal of 42645205 is 50254624.

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 19518724 + 23126481 = 4418^2 + 4809^2 .

It is not a de Polignac number, because 42645205 - 2⁵ = 42645173 is a prime.

It is a super-2 number, since 2×42645205² = 3637227018984050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4264516 + ... + 4264525.

It is an arithmetic number, because the mean of its divisors is an integer number (12793563).

Almost surely, 2^42645205 is an apocalyptic number.

It is an amenable number.

42645205 is a deficient number, since it is larger than the sum of its proper divisors (8529047).

42645205 is an equidigital number, since it uses as much as digits as its factorization.

42645205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8529046.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 42645205 is about 6530.3296241461. The cubic root of 42645205 is about 349.3735870284.

Adding to 42645205 its reverse (50254624), we get a palindrome (92899829).

The spelling of 42645205 in words is "forty-two million, six hundred forty-five thousand, two hundred five".