3975121 has 4 divisors (see below), whose sum is σ = 4011700. Its totient is φ = 3938544.

The previous prime is 3975109. The next prime is 3975151. The reversal of 3975121 is 1215793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1215793 = 239 ⋅5087.

It can be written as a sum of positive squares in 2 ways, for example, as 2070721 + 1904400 = 1439^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 3975121 - 2⁵ = 3975089 is a prime.

It is an Ulam number.

It is a Duffinian number.

3975121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3975121.

It is not an unprimeable number, because it can be changed into a prime (3975151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18126 + ... + 18343.

It is an arithmetic number, because the mean of its divisors is an integer number (1002925).

Almost surely, 2^3975121 is an apocalyptic number.

It is an amenable number.

3975121 is a deficient number, since it is larger than the sum of its proper divisors (36579).

3975121 is a wasteful number, since it uses less digits than its factorization.

3975121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36578.

The product of its digits is 1890, while the sum is 28.

The square root of 3975121 is about 1993.7705484835. The cubic root of 3975121 is about 158.4103125832.

It can be divided in two parts, 3975 and 121, that added together give a 12-th power (4096 = 2¹²).

The spelling of 3975121 in words is "three million, nine hundred seventy-five thousand, one hundred twenty-one".