4020905 has 8 divisors (see below), whose sum is σ = 5514432. Its totient is φ = 2757168.

The previous prime is 4020889. The next prime is 4020923. The reversal of 4020905 is 5090204.

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

It is a cyclic number.

It is not a de Polignac number, because 4020905 - 2⁴ = 4020889 is a prime.

It is a Curzon 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, 57407 + ... + 57476.

It is an arithmetic number, because the mean of its divisors is an integer number (689304).

Almost surely, 2^4020905 is an apocalyptic number.

It is an amenable number.

4020905 is a deficient number, since it is larger than the sum of its proper divisors (1493527).

4020905 is a wasteful number, since it uses less digits than its factorization.

4020905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114895.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 4020905 is about 2005.2194393632. The cubic root of 4020905 is about 159.0161633292.

The spelling of 4020905 in words is "four million, twenty thousand, nine hundred five".