3984861 has 16 divisors (see below), whose sum is σ = 5549760. Its totient is φ = 2540160.

The previous prime is 3984859. The next prime is 3984917. The reversal of 3984861 is 1684893.

It is not a de Polignac number, because 3984861 - 2¹ = 3984859 is a prime.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3984061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14041 + ... + 14321.

It is an arithmetic number, because the mean of its divisors is an integer number (346860).

Almost surely, 2^3984861 is an apocalyptic number.

It is an amenable number.

3984861 is a deficient number, since it is larger than the sum of its proper divisors (1564899).

3984861 is a wasteful number, since it uses less digits than its factorization.

3984861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476.

The product of its digits is 41472, while the sum is 39.

The square root of 3984861 is about 1996.2116621240. The cubic root of 3984861 is about 158.5395881436.

Subtracting from 3984861 its reverse (1684893), we obtain a cube (2299968 = 132³).

The spelling of 3984861 in words is "three million, nine hundred eighty-four thousand, eight hundred sixty-one".