6689402 has 4 divisors (see below), whose sum is σ = 10034106. Its totient is φ = 3344700.

The previous prime is 6689399. The next prime is 6689413. The reversal of 6689402 is 2049866.

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

It can be written as a sum of positive squares in only one way, i.e., 5707321 + 982081 = 2389^2 + 991^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1672349 + ... + 1672352.

Almost surely, 2^6689402 is an apocalyptic number.

6689402 is a deficient number, since it is larger than the sum of its proper divisors (3344704).

6689402 is a wasteful number, since it uses less digits than its factorization.

6689402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344703.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6689402 is about 2586.3878286135. The cubic root of 6689402 is about 188.4209107053.

Subtracting from 6689402 its product of nonzero digits (20736), we obtain a palindrome (6668666).

The spelling of 6689402 in words is "six million, six hundred eighty-nine thousand, four hundred two".