4391890 has 16 divisors (see below), whose sum is σ = 7931520. Its totient is φ = 1750960.

The previous prime is 4391887. The next prime is 4391897. The reversal of 4391890 is 981934.

It is not an unprimeable number, because it can be changed into a prime (4391897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3801 + ... + 4819.

It is an arithmetic number, because the mean of its divisors is an integer number (495720).

Almost surely, 2^4391890 is an apocalyptic number.

4391890 is a deficient number, since it is larger than the sum of its proper divisors (3539630).

4391890 is a wasteful number, since it uses less digits than its factorization.

4391890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 4391890 is about 2095.6836593341. The cubic root of 4391890 is about 163.7635149966.

The spelling of 4391890 in words is "four million, three hundred ninety-one thousand, eight hundred ninety".