42065545 has 4 divisors (see below), whose sum is σ = 50478660. Its totient is φ = 33652432.

The previous prime is 42065533. The next prime is 42065557. The reversal of 42065545 is 54556024.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42065533) and next prime (42065557).

It can be written as a sum of positive squares in 2 ways, for example, as 30614089 + 11451456 = 5533^2 + 3384^2 .

It is a cyclic number.

It is not a de Polignac number, because 42065545 - 2⁹ = 42065033 is a prime.

It is a super-2 number, since 2×42065545² = 3539020152294050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 4206550 + ... + 4206559.

It is an arithmetic number, because the mean of its divisors is an integer number (12619665).

Almost surely, 2^42065545 is an apocalyptic number.

It is an amenable number.

42065545 is a deficient number, since it is larger than the sum of its proper divisors (8413115).

42065545 is an equidigital number, since it uses as much as digits as its factorization.

42065545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8413114.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 42065545 is about 6485.7956335364. The cubic root of 42065545 is about 347.7833928609.

The spelling of 42065545 in words is "forty-two million, sixty-five thousand, five hundred forty-five".