9978172 has 6 divisors (see below), whose sum is σ = 17461808. Its totient is φ = 4989084.

The previous prime is 9978169. The next prime is 9978179. The reversal of 9978172 is 2718799.

It is a happy number.

It is a super-3 number, since 3×9978172³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1247268 + ... + 1247275.

Almost surely, 2^9978172 is an apocalyptic number.

It is an amenable number.

9978172 is a deficient number, since it is larger than the sum of its proper divisors (7483636).

9978172 is a wasteful number, since it uses less digits than its factorization.

9978172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494547 (or 2494545 counting only the distinct ones).

The product of its digits is 63504, while the sum is 43.

The square root of 9978172 is about 3158.8244648920. The cubic root of 9978172 is about 215.2865981405.

The spelling of 9978172 in words is "nine million, nine hundred seventy-eight thousand, one hundred seventy-two".