6742409 has 4 divisors (see below), whose sum is σ = 6906900. Its totient is φ = 6577920.

The previous prime is 6742369. The next prime is 6742423. The reversal of 6742409 is 9042476.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2449225 + 4293184 = 1565^2 + 2072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6742409 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 (6742459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82184 + ... + 82265.

It is an arithmetic number, because the mean of its divisors is an integer number (1726725).

Almost surely, 2^6742409 is an apocalyptic number.

It is an amenable number.

6742409 is a deficient number, since it is larger than the sum of its proper divisors (164491).

6742409 is a wasteful number, since it uses less digits than its factorization.

6742409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164490.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 6742409 is about 2596.6149117649. The cubic root of 6742409 is about 188.9172860164.

The spelling of 6742409 in words is "six million, seven hundred forty-two thousand, four hundred nine".