4091890 has 16 divisors (see below), whose sum is σ = 8035200. Its totient is φ = 1487920.

The previous prime is 4091873. The next prime is 4091909. The reversal of 4091890 is 981904.

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, 18490 + ... + 18709.

It is an arithmetic number, because the mean of its divisors is an integer number (502200).

Almost surely, 2^4091890 is an apocalyptic number.

4091890 is a deficient number, since it is larger than the sum of its proper divisors (3943310).

4091890 is a wasteful number, since it uses less digits than its factorization.

4091890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37217.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 4091890 is about 2022.8420600729. The cubic root of 4091890 is about 159.9464664655.

The spelling of 4091890 in words is "four million, ninety-one thousand, eight hundred ninety".