4091090 has 16 divisors (see below), whose sum is σ = 7563672. Its totient is φ = 1592064.

The previous prime is 4091083. The next prime is 4091161. The reversal of 4091090 is 901904.

It can be written as a sum of positive squares in 4 ways, for example, as 3455881 + 635209 = 1859^2 + 797^2 .

It is a super-3 number, since 3×4091090³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5159 + ... + 5898.

Almost surely, 2^4091090 is an apocalyptic number.

4091090 is a deficient number, since it is larger than the sum of its proper divisors (3472582).

4091090 is a wasteful number, since it uses less digits than its factorization.

4091090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11101.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 4091090 is about 2022.6443088195. The cubic root of 4091090 is about 159.9360421454.

Adding to 4091090 its reverse (901904), we get a palindrome (4992994).

The spelling of 4091090 in words is "four million, ninety-one thousand, ninety".