3996881 has 6 divisors (see below), whose sum is σ = 4649490. Its totient is φ = 3425856.

The previous prime is 3996869. The next prime is 3996911. The reversal of 3996881 is 1886993.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 1731856 = 1505^2 + 1316^2 .

It is not a de Polignac number, because 3996881 - 2¹⁸ = 3734737 is a prime.

It is a super-2 number, since 2×3996881² = 31950115456322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3996281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40736 + ... + 40833.

It is an arithmetic number, because the mean of its divisors is an integer number (774915).

Almost surely, 2^3996881 is an apocalyptic number.

It is an amenable number.

3996881 is a deficient number, since it is larger than the sum of its proper divisors (652609).

3996881 is an equidigital number, since it uses as much as digits as its factorization.

3996881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81583 (or 81576 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 3996881 is about 1999.2200979382. The cubic root of 3996881 is about 158.6988352692.

The spelling of 3996881 in words is "three million, nine hundred ninety-six thousand, eight hundred eighty-one".