3909121 has 4 divisors (see below), whose sum is σ = 3982932. Its totient is φ = 3835312.

The previous prime is 3909107. The next prime is 3909127. The reversal of 3909121 is 1219093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1219093 = 43 ⋅28351.

It can be written as a sum of positive squares in 2 ways, for example, as 1718721 + 2190400 = 1311^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 3909121 - 2⁹ = 3908609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3909127) 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, 36826 + ... + 36931.

It is an arithmetic number, because the mean of its divisors is an integer number (995733).

Almost surely, 2^3909121 is an apocalyptic number.

It is an amenable number.

3909121 is a deficient number, since it is larger than the sum of its proper divisors (73811).

3909121 is an equidigital number, since it uses as much as digits as its factorization.

3909121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73810.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 3909121 is about 1977.1497161318. The cubic root of 3909121 is about 157.5287056102.

The spelling of 3909121 in words is "three million, nine hundred nine thousand, one hundred twenty-one".