9981854 has 4 divisors (see below), whose sum is σ = 14972784. Its totient is φ = 4990926.

The previous prime is 9981847. The next prime is 9981863. The reversal of 9981854 is 4581899.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495462 + ... + 2495465.

It is an arithmetic number, because the mean of its divisors is an integer number (3743196).

Almost surely, 2^9981854 is an apocalyptic number.

9981854 is a deficient number, since it is larger than the sum of its proper divisors (4990930).

9981854 is a wasteful number, since it uses less digits than its factorization.

9981854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990929.

The product of its digits is 103680, while the sum is 44.

The square root of 9981854 is about 3159.4072228822. The cubic root of 9981854 is about 215.3130755277.

The spelling of 9981854 in words is "nine million, nine hundred eighty-one thousand, eight hundred fifty-four".