9990457 has 2 divisors, whose sum is σ = 9990458. Its totient is φ = 9990456.

The previous prime is 9990403. The next prime is 9990467. The reversal of 9990457 is 7540999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9114361 + 876096 = 3019^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 9990457 - 2¹⁹ = 9466169 is a prime.

9990457 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9990467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995228 + 4995229.

It is an arithmetic number, because the mean of its divisors is an integer number (4995229).

Almost surely, 2^9990457 is an apocalyptic number.

It is an amenable number.

9990457 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990457 is an equidigital number, since it uses as much as digits as its factorization.

9990457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 9990457 is about 3160.7684192297. The cubic root of 9990457 is about 215.3749146239.

The spelling of 9990457 in words is "nine million, nine hundred ninety thousand, four hundred fifty-seven".