3992005 has 8 divisors (see below), whose sum is σ = 4856472. Its totient is φ = 3149568.

The previous prime is 3991997. The next prime is 3992011. The reversal of 3992005 is 5002993.

It is a Cunningham number, because it is equal to 1998²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1435204 + 2556801 = 1198^2 + 1599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3992005 - 2³ = 3991997 is a prime.

It is a super-2 number, since 2×3992005² = 31872207840050, which contains 22 as substring.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5104 + ... + 5833.

It is an arithmetic number, because the mean of its divisors is an integer number (607059).

Almost surely, 2^3992005 is an apocalyptic number.

It is an amenable number.

3992005 is a deficient number, since it is larger than the sum of its proper divisors (864467).

3992005 is a wasteful number, since it uses less digits than its factorization.

3992005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11015.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 3992005 is about 1998.0002502502. Note that the first 3 decimals coincide. The cubic root of 3992005 is about 158.6342740604.

Adding to 3992005 its reverse (5002993), we get a palindrome (8994998).

The spelling of 3992005 in words is "three million, nine hundred ninety-two thousand, five".