6667409 has 4 divisors (see below), whose sum is σ = 7619904. Its totient is φ = 5714916.

The previous prime is 6667403. The next prime is 6667429. The reversal of 6667409 is 9047666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9047666 = 2 ⋅4523833.

It is a cyclic number.

It is not a de Polignac number, because 6667409 - 2⁴ = 6667393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6667403) 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, 476237 + ... + 476250.

It is an arithmetic number, because the mean of its divisors is an integer number (1904976).

Almost surely, 2^6667409 is an apocalyptic number.

It is an amenable number.

6667409 is a deficient number, since it is larger than the sum of its proper divisors (952495).

6667409 is an equidigital number, since it uses as much as digits as its factorization.

6667409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952494.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 6667409 is about 2582.1326457020. The cubic root of 6667409 is about 188.2141911411.

It can be divided in two parts, 666 and 7409, that multiplied together give a palindrome (4934394).

The spelling of 6667409 in words is "six million, six hundred sixty-seven thousand, four hundred nine".