9998172 has 36 divisors (see below), whose sum is σ = 25421760. Its totient is φ = 3313152.

The previous prime is 9998147. The next prime is 9998173. The reversal of 9998172 is 2718999.

9998172 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9998173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6229 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (706160).

Almost surely, 2^9998172 is an apocalyptic number.

It is an amenable number.

9998172 is an abundant number, since it is smaller than the sum of its proper divisors (15423588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9998172 is a wasteful number, since it uses less digits than its factorization.

9998172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1637 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 9998172 is about 3161.9886147803. The cubic root of 9998172 is about 215.4303405145.

The spelling of 9998172 in words is "nine million, nine hundred ninety-eight thousand, one hundred seventy-two".