4005890 has 32 divisors (see below), whose sum is σ = 8346240. Its totient is φ = 1355904.

The previous prime is 4005889. The next prime is 4005893. The reversal of 4005890 is 985004.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4005893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5909 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (260820).

Almost surely, 2^4005890 is an apocalyptic number.

4005890 is an abundant number, since it is smaller than the sum of its proper divisors (4340350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4005890 is a wasteful number, since it uses less digits than its factorization.

4005890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 4005890 is about 2001.4719583347. The cubic root of 4005890 is about 158.8179819198.

The spelling of 4005890 in words is "four million, five thousand, eight hundred ninety".