3912409 has 4 divisors (see below), whose sum is σ = 3919104. Its totient is φ = 3905716.

The previous prime is 3912401. The next prime is 3912413. The reversal of 3912409 is 9042193.

It is a happy number.

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: 9042193 = 809 ⋅11177.

It is a cyclic number.

It is not a de Polignac number, because 3912409 - 2³ = 3912401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3912401) 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, 2377 + ... + 3670.

It is an arithmetic number, because the mean of its divisors is an integer number (979776).

Almost surely, 2^3912409 is an apocalyptic number.

It is an amenable number.

3912409 is a deficient number, since it is larger than the sum of its proper divisors (6695).

3912409 is an equidigital number, since it uses as much as digits as its factorization.

3912409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3912409 is about 1977.9810413652. The cubic root of 3912409 is about 157.5728595460.

The spelling of 3912409 in words is "three million, nine hundred twelve thousand, four hundred nine".