6435409 has 4 divisors (see below), whose sum is σ = 6440500. Its totient is φ = 6430320.

The previous prime is 6435379. The next prime is 6435413. The reversal of 6435409 is 9045346.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2334784 + 4100625 = 1528^2 + 2025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6435409 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6435449) 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, 967 + ... + 3715.

It is an arithmetic number, because the mean of its divisors is an integer number (1610125).

Almost surely, 2^6435409 is an apocalyptic number.

It is an amenable number.

6435409 is a deficient number, since it is larger than the sum of its proper divisors (5091).

6435409 is a wasteful number, since it uses less digits than its factorization.

6435409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6435409 is about 2536.8107931022. The cubic root of 6435409 is about 186.0053280163.

The spelling of 6435409 in words is "six million, four hundred thirty-five thousand, four hundred nine".