6690138 has 32 divisors (see below), whose sum is σ = 16469376. Its totient is φ = 1764288.

The previous prime is 6690119. The next prime is 6690143. The reversal of 6690138 is 8310966.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6690099 and 6690108.

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 in 15 ways as a sum of consecutive naturals, for example, 5581 + ... + 6672.

It is an arithmetic number, because the mean of its divisors is an integer number (514668).

Almost surely, 2^6690138 is an apocalyptic number.

6690138 is an abundant number, since it is smaller than the sum of its proper divisors (9779238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6690138 is a wasteful number, since it uses less digits than its factorization.

6690138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 6690138 is about 2586.5301080792. The cubic root of 6690138 is about 188.4278207751.

The spelling of 6690138 in words is "six million, six hundred ninety thousand, one hundred thirty-eight".