3621409 has 9 divisors (see below), whose sum is σ = 4003699. Its totient is φ = 3273160.

The previous prime is 3621403. The next prime is 3621461. The reversal of 3621409 is 9041263.

The square root of 3621409 is 1903.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 327184 = 1815^2 + 572^2 .

It is not a de Polignac number, because 3621409 - 2¹³ = 3613217 is a prime.

It is a super-2 number, since 2×3621409² = 26229206290562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3621403) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20847 + ... + 21019.

Almost surely, 2^3621409 is an apocalyptic number.

3621409 is the 1903-rd square number.

3621409 is the 952-nd centered octagonal number.

It is an amenable number.

3621409 is a deficient number, since it is larger than the sum of its proper divisors (382290).

3621409 is an equidigital number, since it uses as much as digits as its factorization.

3621409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The cubic root of 3621409 is about 153.5650995151.

Multiplying 3621409 by its sum of digits (25), we get a square (90535225 = 9515²).

Multiplying 3621409 by its product of nonzero digits (1296), we get a square (4693346064 = 68508²).

It can be divided in two parts, 362 and 1409, that added together give a palindrome (1771).

The spelling of 3621409 in words is "three million, six hundred twenty-one thousand, four hundred nine".