8428138 has 4 divisors (see below), whose sum is σ = 12642210. Its totient is φ = 4214068.

The previous prime is 8428099. The next prime is 8428139. The reversal of 8428138 is 8318248.

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., 8427409 + 729 = 2903^2 + 27^2 .

It is not an unprimeable number, because it can be changed into a prime (8428139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2107033 + ... + 2107036.

Almost surely, 2^8428138 is an apocalyptic number.

8428138 is a deficient number, since it is larger than the sum of its proper divisors (4214072).

8428138 is a wasteful number, since it uses less digits than its factorization.

8428138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214071.

The product of its digits is 12288, while the sum is 34.

The square root of 8428138 is about 2903.1255570505. The cubic root of 8428138 is about 203.5059974447.

The spelling of 8428138 in words is "eight million, four hundred twenty-eight thousand, one hundred thirty-eight".