4090661 has 4 divisors (see below), whose sum is σ = 4128300. Its totient is φ = 4053024.

The previous prime is 4090651. The next prime is 4090663. The reversal of 4090661 is 1660904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1221025 + 2869636 = 1105^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 4090661 - 2¹⁴ = 4074277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4090661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4090663) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 18656 + ... + 18873.

It is an arithmetic number, because the mean of its divisors is an integer number (1032075).

Almost surely, 2^4090661 is an apocalyptic number.

It is an amenable number.

4090661 is a deficient number, since it is larger than the sum of its proper divisors (37639).

4090661 is a wasteful number, since it uses less digits than its factorization.

4090661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37638.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 4090661 is about 2022.5382567457. The cubic root of 4090661 is about 159.9304515440.

The spelling of 4090661 in words is "four million, ninety thousand, six hundred sixty-one".