4009555 has 8 divisors (see below), whose sum is σ = 5248944. Its totient is φ = 2916000.

The previous prime is 4009549. The next prime is 4009619. The reversal of 4009555 is 5559004.

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

It is not a de Polignac number, because 4009555 - 2³ = 4009547 is a prime.

It is a Duffinian number.

4009555 is a lucky 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, 36396 + ... + 36505.

It is an arithmetic number, because the mean of its divisors is an integer number (656118).

Almost surely, 2^4009555 is an apocalyptic number.

4009555 is a deficient number, since it is larger than the sum of its proper divisors (1239389).

4009555 is a wasteful number, since it uses less digits than its factorization.

4009555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72917.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 4009555 is about 2002.3873251696. The cubic root of 4009555 is about 158.8664014955.

It can be divided in two parts, 400955 and 5, that added together give a triangular number (400960 = T₈₉₅).

The spelling of 4009555 in words is "four million, nine thousand, five hundred fifty-five".