3996845 has 4 divisors (see below), whose sum is σ = 4796220. Its totient is φ = 3197472.

The previous prime is 3996827. The next prime is 3996857. The reversal of 3996845 is 5486993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5486993 = 157 ⋅34949.

It can be written as a sum of positive squares in 2 ways, for example, as 1261129 + 2735716 = 1123^2 + 1654^2 .

It is a cyclic number.

It is not a de Polignac number, because 3996845 - 2⁸ = 3996589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3996796 and 3996805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399680 + ... + 399689.

It is an arithmetic number, because the mean of its divisors is an integer number (1199055).

Almost surely, 2^3996845 is an apocalyptic number.

It is an amenable number.

3996845 is a deficient number, since it is larger than the sum of its proper divisors (799375).

3996845 is an equidigital number, since it uses as much as digits as its factorization.

3996845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799374.

The product of its digits is 233280, while the sum is 44.

The square root of 3996845 is about 1999.2110944070. The cubic root of 3996845 is about 158.6983587997.

The spelling of 3996845 in words is "three million, nine hundred ninety-six thousand, eight hundred forty-five".