3964409 has 4 divisors (see below), whose sum is σ = 3970404. Its totient is φ = 3958416.

The previous prime is 3964399. The next prime is 3964421. The reversal of 3964409 is 9044693.

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: 9044693 = 7 ⋅1292099.

It can be written as a sum of positive squares in 2 ways, for example, as 2958400 + 1006009 = 1720^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 3964409 - 2⁴ = 3964393 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3964489) 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, 1862 + ... + 3375.

It is an arithmetic number, because the mean of its divisors is an integer number (992601).

Almost surely, 2^3964409 is an apocalyptic number.

It is an amenable number.

3964409 is a deficient number, since it is larger than the sum of its proper divisors (5995).

3964409 is an equidigital number, since it uses as much as digits as its factorization.

3964409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5994.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 3964409 is about 1991.0823689642. The cubic root of 3964409 is about 158.2678919463.

The spelling of 3964409 in words is "three million, nine hundred sixty-four thousand, four hundred nine".