3992661 has 6 divisors (see below), whose sum is σ = 5767190. Its totient is φ = 2661768.

The previous prime is 3992627. The next prime is 3992683. The reversal of 3992661 is 1662993.

3992661 is a `hidden beast` number, since 399 + 266 + 1 = 666.

3992661 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in only one way, i.e., 3261636 + 731025 = 1806^2 + 855^2 .

It is not a de Polignac number, because 3992661 - 2⁷ = 3992533 is a prime.

It is a Duffinian number.

It is a Curzon number.

3992661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3992761) 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 5 ways as a sum of consecutive naturals, for example, 221806 + ... + 221823.

Almost surely, 2^3992661 is an apocalyptic number.

It is an amenable number.

3992661 is a deficient number, since it is larger than the sum of its proper divisors (1774529).

3992661 is a wasteful number, since it uses less digits than its factorization.

3992661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443635 (or 443632 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3992661 is about 1998.1644076502. The cubic root of 3992661 is about 158.6429629593.

The spelling of 3992661 in words is "three million, nine hundred ninety-two thousand, six hundred sixty-one".