9172428 has 12 divisors (see below), whose sum is σ = 21402360. Its totient is φ = 3057472.

The previous prime is 9172409. The next prime is 9172433. The reversal of 9172428 is 8242719.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382173 + ... + 382196.

It is an arithmetic number, because the mean of its divisors is an integer number (1783530).

Almost surely, 2^9172428 is an apocalyptic number.

It is an amenable number.

9172428 is an abundant number, since it is smaller than the sum of its proper divisors (12229932).

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

9172428 is a wasteful number, since it uses less digits than its factorization.

9172428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764376 (or 764374 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 9172428 is about 3028.6016575311. The cubic root of 9172428 is about 209.3283758365.

The spelling of 9172428 in words is "nine million, one hundred seventy-two thousand, four hundred twenty-eight".