9981904 has 10 divisors (see below), whose sum is σ = 19339970. Its totient is φ = 4990944.

The previous prime is 9981899. The next prime is 9981911. The reversal of 9981904 is 4091899.

It can be written as a sum of positive squares in only one way, i.e., 5053504 + 4928400 = 2248^2 + 2220^2 .

It is a congruent number.

It is an unprimeable number.

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, 311919 + ... + 311950.

It is an arithmetic number, because the mean of its divisors is an integer number (1933997).

Almost surely, 2^9981904 is an apocalyptic number.

It is an amenable number.

9981904 is a deficient number, since it is larger than the sum of its proper divisors (9358066).

9981904 is a wasteful number, since it uses less digits than its factorization.

9981904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623877 (or 623871 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 9981904 is about 3159.4151357490. The cubic root of 9981904 is about 215.3134350346.

The spelling of 9981904 in words is "nine million, nine hundred eighty-one thousand, nine hundred four".