4005605 has 8 divisors (see below), whose sum is σ = 4819992. Its totient is φ = 3195648.

The previous prime is 4005553. The next prime is 4005613. The reversal of 4005605 is 5065004.

It can be written as a sum of positive squares in 4 ways, for example, as 187489 + 3818116 = 433^2 + 1954^2 .

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 4005605 - 2¹² = 4001509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1409 + ... + 3161.

It is an arithmetic number, because the mean of its divisors is an integer number (602499).

Almost surely, 2^4005605 is an apocalyptic number.

It is an amenable number.

4005605 is a deficient number, since it is larger than the sum of its proper divisors (814387).

4005605 is a wasteful number, since it uses less digits than its factorization.

4005605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 4005605 is about 2001.4007594682. The cubic root of 4005605 is about 158.8142154494.

The spelling of 4005605 in words is "four million, five thousand, six hundred five".