3992561 has 4 divisors (see below), whose sum is σ = 4029300. Its totient is φ = 3955824.

The previous prime is 3992533. The next prime is 3992563. The reversal of 3992561 is 1652993.

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 3352561 + 640000 = 1831^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 3992561 - 2¹⁴ = 3976177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3992563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18206 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (1007325).

Almost surely, 2^3992561 is an apocalyptic number.

It is an amenable number.

3992561 is a deficient number, since it is larger than the sum of its proper divisors (36739).

3992561 is a wasteful number, since it uses less digits than its factorization.

3992561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36738.

The product of its digits is 14580, while the sum is 35.

The square root of 3992561 is about 1998.1393845275. The cubic root of 3992561 is about 158.6416384935.

The spelling of 3992561 in words is "three million, nine hundred ninety-two thousand, five hundred sixty-one".