4000445 has 4 divisors (see below), whose sum is σ = 4800540. Its totient is φ = 3200352.

The previous prime is 4000439. The next prime is 4000489. The reversal of 4000445 is 5440004.

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 2292196 + 1708249 = 1514^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000445 - 2⁸ = 4000189 is a prime.

It is an Ulam number.

It is a Curzon number.

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, 400040 + ... + 400049.

It is an arithmetic number, because the mean of its divisors is an integer number (1200135).

Almost surely, 2^4000445 is an apocalyptic number.

It is an amenable number.

4000445 is a deficient number, since it is larger than the sum of its proper divisors (800095).

4000445 is an equidigital number, since it uses as much as digits as its factorization.

4000445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800094.

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 4000445 is about 2000.1112469060. Note that the first 3 decimals coincide. The cubic root of 4000445 is about 158.7459915908.

Adding to 4000445 its reverse (5440004), we get a palindrome (9440449).

The spelling of 4000445 in words is "four million, four hundred forty-five", and thus it is an aban number.