8749821 has 16 divisors (see below), whose sum is σ = 12260736. Its totient is φ = 5539776.

The previous prime is 8749817. The next prime is 8749837. The reversal of 8749821 is 1289478.

8749821 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8749821 - 2² = 8749817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8749821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8749841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11571 + ... + 12303.

It is an arithmetic number, because the mean of its divisors is an integer number (766296).

Almost surely, 2^8749821 is an apocalyptic number.

It is an amenable number.

8749821 is a deficient number, since it is larger than the sum of its proper divisors (3510915).

8749821 is a wasteful number, since it uses less digits than its factorization.

8749821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932.

The product of its digits is 32256, while the sum is 39.

The square root of 8749821 is about 2958.0096348727. The cubic root of 8749821 is about 206.0628598188.

The spelling of 8749821 in words is "eight million, seven hundred forty-nine thousand, eight hundred twenty-one".