9981538 has 8 divisors (see below), whose sum is σ = 17111232. Its totient is φ = 4277796.

The previous prime is 9981467. The next prime is 9981551. The reversal of 9981538 is 8351899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×9981538² = 199262201690888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9981494 and 9981503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356470 + ... + 356497.

It is an arithmetic number, because the mean of its divisors is an integer number (2138904).

Almost surely, 2^9981538 is an apocalyptic number.

9981538 is a deficient number, since it is larger than the sum of its proper divisors (7129694).

9981538 is a wasteful number, since it uses less digits than its factorization.

9981538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712976.

The product of its digits is 77760, while the sum is 43.

The square root of 9981538 is about 3159.3572131052. The cubic root of 9981538 is about 215.3108034164.

The spelling of 9981538 in words is "nine million, nine hundred eighty-one thousand, five hundred thirty-eight".