4009845 has 16 divisors (see below), whose sum is σ = 7332480. Its totient is φ = 1833024.

The previous prime is 4009823. The next prime is 4009849. The reversal of 4009845 is 5489004.

It is not a de Polignac number, because 4009845 - 2⁶ = 4009781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18990 + ... + 19199.

It is an arithmetic number, because the mean of its divisors is an integer number (458280).

Almost surely, 2^4009845 is an apocalyptic number.

It is an amenable number.

4009845 is a deficient number, since it is larger than the sum of its proper divisors (3322635).

4009845 is a wasteful number, since it uses less digits than its factorization.

4009845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38204.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 4009845 is about 2002.4597374230. The cubic root of 4009845 is about 158.8702315253.

The spelling of 4009845 in words is "four million, nine thousand, eight hundred forty-five".