4020005 has 8 divisors (see below), whose sum is σ = 5262624. Its totient is φ = 2923600.

The previous prime is 4019993. The next prime is 4020011. The reversal of 4020005 is 5000204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4020005 - 2¹⁰ = 4018981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (11).

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 36491 + ... + 36600.

It is an arithmetic number, because the mean of its divisors is an integer number (657828).

Almost surely, 2^4020005 is an apocalyptic number.

It is an amenable number.

4020005 is a deficient number, since it is larger than the sum of its proper divisors (1242619).

4020005 is a wasteful number, since it uses less digits than its factorization.

4020005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73107.

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 4020005 is about 2004.9950124626. The cubic root of 4020005 is about 159.0042982370.

Adding to 4020005 its reverse (5000204), we get a palindrome (9020209).

The spelling of 4020005 in words is "four million, twenty thousand, five".