3988409 has 4 divisors (see below), whose sum is σ = 4063716. Its totient is φ = 3913104.

The previous prime is 3988403. The next prime is 3988427. The reversal of 3988409 is 9048893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2839225 + 1149184 = 1685^2 + 1072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3988409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988403) 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, 37574 + ... + 37679.

It is an arithmetic number, because the mean of its divisors is an integer number (1015929).

Almost surely, 2^3988409 is an apocalyptic number.

It is an amenable number.

3988409 is a deficient number, since it is larger than the sum of its proper divisors (75307).

3988409 is an equidigital number, since it uses as much as digits as its factorization.

3988409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75306.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 3988409 is about 1997.1001477142. The cubic root of 3988409 is about 158.5866271409.

The spelling of 3988409 in words is "three million, nine hundred eighty-eight thousand, four hundred nine".