4018661 has 4 divisors (see below), whose sum is σ = 4050432. Its totient is φ = 3986892.

The previous prime is 4018649. The next prime is 4018699. The reversal of 4018661 is 1668104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4018661 - 2¹⁸ = 3756517 is a prime.

It is a super-2 number, since 2×4018661² = 32299272465842, which contains 22 as substring.

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 4018661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4018631) 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, 15695 + ... + 15948.

It is an arithmetic number, because the mean of its divisors is an integer number (1012608).

Almost surely, 2^4018661 is an apocalyptic number.

It is an amenable number.

4018661 is a deficient number, since it is larger than the sum of its proper divisors (31771).

4018661 is a wasteful number, since it uses less digits than its factorization.

4018661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31770.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4018661 is about 2004.6598215159. The cubic root of 4018661 is about 158.9865764019.

The spelling of 4018661 in words is "four million, eighteen thousand, six hundred sixty-one".