9920997 has 6 divisors (see below), whose sum is σ = 14330342. Its totient is φ = 6613992.

The previous prime is 9920993. The next prime is 9921001. The reversal of 9920997 is 7990299.

It is an interprime number because it is at equal distance from previous prime (9920993) and next prime (9921001).

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 1153476 = 2961^2 + 1074^2 .

It is not a de Polignac number, because 9920997 - 2² = 9920993 is a prime.

It is a Duffinian number.

9920997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9920993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 551158 + ... + 551175.

Almost surely, 2^9920997 is an apocalyptic number.

It is an amenable number.

9920997 is a deficient number, since it is larger than the sum of its proper divisors (4409345).

9920997 is a wasteful number, since it uses less digits than its factorization.

9920997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102339 (or 1102336 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The square root of 9920997 is about 3149.7614195364. The cubic root of 9920997 is about 214.8746123038.

The spelling of 9920997 in words is "nine million, nine hundred twenty thousand, nine hundred ninety-seven".