3681409 has 4 divisors (see below), whose sum is σ = 3690820. Its totient is φ = 3672000.

The previous prime is 3681407. The next prime is 3681413. The reversal of 3681409 is 9041863.

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 2093809 + 1587600 = 1447^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681409 - 2¹ = 3681407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681407) 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, 4092 + ... + 4909.

It is an arithmetic number, because the mean of its divisors is an integer number (922705).

Almost surely, 2^3681409 is an apocalyptic number.

It is an amenable number.

3681409 is a deficient number, since it is larger than the sum of its proper divisors (9411).

3681409 is an equidigital number, since it uses as much as digits as its factorization.

3681409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3681409 is about 1918.6998201907. The cubic root of 3681409 is about 154.4085542300.

It can be divided in two parts, 3681 and 409, that multiplied together give a square (1505529 = 1227²).

The spelling of 3681409 in words is "three million, six hundred eighty-one thousand, four hundred nine".