3984121 has 4 divisors (see below), whose sum is σ = 4038772. Its totient is φ = 3929472.

The previous prime is 3984109. The next prime is 3984131. The reversal of 3984121 is 1214893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1214893 = 271 ⋅4483.

It can be written as a sum of positive squares in 2 ways, for example, as 2134521 + 1849600 = 1461^2 + 1360^2 .

It is a cyclic number.

It is not a de Polignac number, because 3984121 - 2¹¹ = 3982073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3984121.

It is not an unprimeable number, because it can be changed into a prime (3984131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27216 + ... + 27361.

It is an arithmetic number, because the mean of its divisors is an integer number (1009693).

Almost surely, 2^3984121 is an apocalyptic number.

It is an amenable number.

3984121 is a deficient number, since it is larger than the sum of its proper divisors (54651).

3984121 is an equidigital number, since it uses as much as digits as its factorization.

3984121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54650.

The product of its digits is 1728, while the sum is 28.

The square root of 3984121 is about 1996.0263024319. The cubic root of 3984121 is about 158.5297737856.

The spelling of 3984121 in words is "three million, nine hundred eighty-four thousand, one hundred twenty-one".