9872549 has 4 divisors (see below), whose sum is σ = 9894336. Its totient is φ = 9850764.

The previous prime is 9872521. The next prime is 9872567. The reversal of 9872549 is 9452789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9452789 = 113 ⋅83653.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9872549 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9872509) 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, 10199 + ... + 11124.

It is an arithmetic number, because the mean of its divisors is an integer number (2473584).

Almost surely, 2^9872549 is an apocalyptic number.

It is an amenable number.

9872549 is a deficient number, since it is larger than the sum of its proper divisors (21787).

9872549 is a wasteful number, since it uses less digits than its factorization.

9872549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21786.

The product of its digits is 181440, while the sum is 44.

The square root of 9872549 is about 3142.0612661118. The cubic root of 9872549 is about 214.5242699250.

The spelling of 9872549 in words is "nine million, eight hundred seventy-two thousand, five hundred forty-nine".