3997861 has 12 divisors (see below), whose sum is σ = 4711392. Its totient is φ = 3382008.

The previous prime is 3997859. The next prime is 3997871. The reversal of 3997861 is 1687993.

It is not a de Polignac number, because 3997861 - 2¹ = 3997859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3576 + ... + 4558.

It is an arithmetic number, because the mean of its divisors is an integer number (392616).

Almost surely, 2^3997861 is an apocalyptic number.

It is an amenable number.

3997861 is a deficient number, since it is larger than the sum of its proper divisors (713531).

3997861 is an equidigital number, since it uses as much as digits as its factorization.

3997861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080 (or 1073 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 3997861 is about 1999.4651784915. The cubic root of 3997861 is about 158.7118047279.

The spelling of 3997861 in words is "three million, nine hundred ninety-seven thousand, eight hundred sixty-one".