42005145 has 32 divisors (see below), whose sum is σ = 82720512. Its totient is φ = 17724672.

The previous prime is 42005081. The next prime is 42005167. The reversal of 42005145 is 54150024.

It is not a de Polignac number, because 42005145 - 2⁶ = 42005081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14022 + ... + 16751.

It is an arithmetic number, because the mean of its divisors is an integer number (2585016).

Almost surely, 2^42005145 is an apocalyptic number.

It is an amenable number.

42005145 is a deficient number, since it is larger than the sum of its proper divisors (40715367).

42005145 is a wasteful number, since it uses less digits than its factorization.

42005145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30801.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 42005145 is about 6481.1376316199. The cubic root of 42005145 is about 347.6168576846.

Adding to 42005145 its reverse (54150024), we get a palindrome (96155169).

The spelling of 42005145 in words is "forty-two million, five thousand, one hundred forty-five".