2643409 has 8 divisors (see below), whose sum is σ = 2701800. Its totient is φ = 2585856.

The previous prime is 2643397. The next prime is 2643427. The reversal of 2643409 is 9043462.

It can be written as a sum of positive squares in 4 ways, for example, as 172225 + 2471184 = 415^2 + 1572^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2643409 - 2⁹ = 2642897 is a prime.

It is a super-2 number, since 2×2643409² = 13975222282562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2643439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16759 + ... + 16915.

It is an arithmetic number, because the mean of its divisors is an integer number (337725).

2^2643409 is an apocalyptic number.

It is an amenable number.

2643409 is a deficient number, since it is larger than the sum of its proper divisors (58391).

2643409 is a wasteful number, since it uses less digits than its factorization.

2643409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 2643409 is about 1625.8563897220. The cubic root of 2643409 is about 138.2679279845.

The spelling of 2643409 in words is "two million, six hundred forty-three thousand, four hundred nine".