9820138 has 4 divisors (see below), whose sum is σ = 14730210. Its totient is φ = 4910068.

The previous prime is 9820121. The next prime is 9820147. The reversal of 9820138 is 8310289.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8310289 = 13 ⋅639253.

It can be written as a sum of positive squares in only one way, i.e., 5184729 + 4635409 = 2277^2 + 2153^2 .

It is a super-2 number, since 2×9820138² = 192870220678088, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2455033 + ... + 2455036.

Almost surely, 2^9820138 is an apocalyptic number.

9820138 is a deficient number, since it is larger than the sum of its proper divisors (4910072).

9820138 is a wasteful number, since it uses less digits than its factorization.

9820138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910071.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 9820138 is about 3133.7099419059. The cubic root of 9820138 is about 214.1439768305.

The spelling of 9820138 in words is "nine million, eight hundred twenty thousand, one hundred thirty-eight".