6687394 has 8 divisors (see below), whose sum is σ = 11464128. Its totient is φ = 2866020.

The previous prime is 6687391. The next prime is 6687427. The reversal of 6687394 is 4937866.

It is a happy number.

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

It is a super-2 number, since 2×6687394² = 89442477022472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6687394.

It is not an unprimeable number, because it can be changed into a prime (6687391) 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, 238822 + ... + 238849.

It is an arithmetic number, because the mean of its divisors is an integer number (1433016).

Almost surely, 2^6687394 is an apocalyptic number.

6687394 is a deficient number, since it is larger than the sum of its proper divisors (4776734).

6687394 is a wasteful number, since it uses less digits than its factorization.

6687394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477680.

The product of its digits is 217728, while the sum is 43.

The square root of 6687394 is about 2585.9996133024. Note that the first 3 decimals coincide. The cubic root of 6687394 is about 188.4020556541.

The spelling of 6687394 in words is "six million, six hundred eighty-seven thousand, three hundred ninety-four".