9997928 has 8 divisors (see below), whose sum is σ = 18746130. Its totient is φ = 4998960.

The previous prime is 9997927. The next prime is 9997937. The reversal of 9997928 is 8297999.

It can be written as a sum of positive squares in only one way, i.e., 9972964 + 24964 = 3158^2 + 158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 9997928.

It is not an unprimeable number, because it can be changed into a prime (9997927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624863 + ... + 624878.

Almost surely, 2^9997928 is an apocalyptic number.

It is an amenable number.

9997928 is a deficient number, since it is larger than the sum of its proper divisors (8748202).

9997928 is a wasteful number, since it uses less digits than its factorization.

9997928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249747 (or 1249743 counting only the distinct ones).

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

The square root of 9997928 is about 3161.9500312307. The cubic root of 9997928 is about 215.4285880131.

The spelling of 9997928 in words is "nine million, nine hundred ninety-seven thousand, nine hundred twenty-eight".