1004020445 has 4 divisors (see below), whose sum is σ = 1204824540. Its totient is φ = 803216352.

The previous prime is 1004020427. The next prime is 1004020447. The reversal of 1004020445 is 5440204001.

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 257474116 + 746546329 = 16046^2 + 27323^2 .

It is a cyclic number.

It is not a de Polignac number, because 1004020445 - 2¹⁶ = 1003954909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004020447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100402040 + ... + 100402049.

It is an arithmetic number, because the mean of its divisors is an integer number (301206135).

Almost surely, 2^1004020445 is an apocalyptic number.

It is an amenable number.

1004020445 is a deficient number, since it is larger than the sum of its proper divisors (200804095).

1004020445 is an equidigital number, since it uses as much as digits as its factorization.

1004020445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200804094.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 1004020445 is about 31686.2816531066. The cubic root of 1004020445 is about 1001.3383563366.

Adding to 1004020445 its reverse (5440204001), we get a palindrome (6444224446).

The spelling of 1004020445 in words is "one billion, four million, twenty thousand, four hundred forty-five".