4091645 has 16 divisors (see below), whose sum is σ = 5343408. Its totient is φ = 2995200.

The previous prime is 4091627. The next prime is 4091657. The reversal of 4091645 is 5461904.

It can be written as a sum of positive squares in 8 ways, for example, as 19321 + 4072324 = 139^2 + 2018^2 .

It is not a de Polignac number, because 4091645 - 2¹⁶ = 4026109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2495 + ... + 3795.

It is an arithmetic number, because the mean of its divisors is an integer number (333963).

Almost surely, 2^4091645 is an apocalyptic number.

It is an amenable number.

4091645 is a deficient number, since it is larger than the sum of its proper divisors (1251763).

4091645 is a wasteful number, since it uses less digits than its factorization.

4091645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 4091645 is about 2022.7815008053. The cubic root of 4091645 is about 159.9432741618.

The spelling of 4091645 in words is "four million, ninety-one thousand, six hundred forty-five".