6904138 has 4 divisors (see below), whose sum is σ = 10356210. Its totient is φ = 3452068.

The previous prime is 6904133. The next prime is 6904171. The reversal of 6904138 is 8314096.

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., 5678689 + 1225449 = 2383^2 + 1107^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6904133) 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 as a sum of consecutive naturals, namely, 1726033 + ... + 1726036.

Almost surely, 2^6904138 is an apocalyptic number.

6904138 is a deficient number, since it is larger than the sum of its proper divisors (3452072).

6904138 is a wasteful number, since it uses less digits than its factorization.

6904138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452071.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 6904138 is about 2627.5726440957. The cubic root of 6904138 is about 190.4158757624.

The spelling of 6904138 in words is "six million, nine hundred four thousand, one hundred thirty-eight".