4391090 has 48 divisors (see below), whose sum is σ = 9192960. Its totient is φ = 1504800.

The previous prime is 4391089. The next prime is 4391099. The reversal of 4391090 is 901934.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4391099) 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 23 ways as a sum of consecutive naturals, for example, 22895 + ... + 23085.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

Almost surely, 2^4391090 is an apocalyptic number.

4391090 is an abundant number, since it is smaller than the sum of its proper divisors (4801870).

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

4391090 is a wasteful number, since it uses less digits than its factorization.

4391090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 4391090 is about 2095.4927821398. The cubic root of 4391090 is about 163.7535710038.

The spelling of 4391090 in words is "four million, three hundred ninety-one thousand, ninety".