9990547 has 4 divisors (see below), whose sum is σ = 11417776. Its totient is φ = 8563320.

The previous prime is 9990499. The next prime is 9990551. The reversal of 9990547 is 7450999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7450999 = 29 ⋅256931.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990547 is a prime.

It is a super-2 number, since 2×9990547² = 199622058718418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9990557) by changing a digit.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713604 + ... + 713617.

It is an arithmetic number, because the mean of its divisors is an integer number (2854444).

Almost surely, 2^9990547 is an apocalyptic number.

9990547 is a deficient number, since it is larger than the sum of its proper divisors (1427229).

9990547 is a wasteful number, since it uses less digits than its factorization.

9990547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427228.

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

The square root of 9990547 is about 3160.7826562420. The cubic root of 9990547 is about 215.3755613639.

The spelling of 9990547 in words is "nine million, nine hundred ninety thousand, five hundred forty-seven".