3630409 has 4 divisors (see below), whose sum is σ = 3640516. Its totient is φ = 3620304.

The previous prime is 3630397. The next prime is 3630433. The reversal of 3630409 is 9040363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9040363 = 43 ⋅210241.

It can be written as a sum of positive squares in 2 ways, for example, as 2624400 + 1006009 = 1620^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 3630409 - 2⁵ = 3630377 is a prime.

It is a Duffinian number.

3630409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3630709) 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, 4494 + ... + 5239.

It is an arithmetic number, because the mean of its divisors is an integer number (910129).

Almost surely, 2^3630409 is an apocalyptic number.

It is an amenable number.

3630409 is a deficient number, since it is larger than the sum of its proper divisors (10107).

3630409 is an equidigital number, since it uses as much as digits as its factorization.

3630409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10106.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 3630409 is about 1905.3632199662. The cubic root of 3630409 is about 153.6922086545.

The spelling of 3630409 in words is "three million, six hundred thirty thousand, four hundred nine".