3989121 has 4 divisors (see below), whose sum is σ = 5318832. Its totient is φ = 2659412.

The previous prime is 3989119. The next prime is 3989123. The reversal of 3989121 is 1219893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1219893 = 3 ⋅406631.

It is an interprime number because it is at equal distance from previous prime (3989119) and next prime (3989123).

It is a cyclic number.

It is not a de Polignac number, because 3989121 - 2¹ = 3989119 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3989123) 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, 664851 + ... + 664856.

It is an arithmetic number, because the mean of its divisors is an integer number (1329708).

Almost surely, 2^3989121 is an apocalyptic number.

It is an amenable number.

3989121 is a deficient number, since it is larger than the sum of its proper divisors (1329711).

3989121 is a wasteful number, since it uses less digits than its factorization.

3989121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329710.

The product of its digits is 3888, while the sum is 33.

The square root of 3989121 is about 1997.2783982209. The cubic root of 3989121 is about 158.5960633982.

The spelling of 3989121 in words is "three million, nine hundred eighty-nine thousand, one hundred twenty-one".