9998972 has 12 divisors (see below), whose sum is σ = 17695440. Its totient is φ = 4943136.

The previous prime is 9998971. The next prime is 9998977. The reversal of 9998972 is 2798999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998971) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 13688 + ... + 14399.

It is an arithmetic number, because the mean of its divisors is an integer number (1474620).

Almost surely, 2^9998972 is an apocalyptic number.

It is an amenable number.

9998972 is a deficient number, since it is larger than the sum of its proper divisors (7696468).

9998972 is a wasteful number, since it uses less digits than its factorization.

9998972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28180 (or 28178 counting only the distinct ones).

The product of its digits is 734832, while the sum is 53.

The square root of 9998972 is about 3162.1151149191. The cubic root of 9998972 is about 215.4360862207.

The spelling of 9998972 in words is "nine million, nine hundred ninety-eight thousand, nine hundred seventy-two".