8721812 has 12 divisors (see below), whose sum is σ = 16650816. Its totient is φ = 3964440.

The previous prime is 8721773. The next prime is 8721851. The reversal of 8721812 is 2181278.

It is an interprime number because it is at equal distance from previous prime (8721773) and next prime (8721851).

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99068 + ... + 99155.

It is an arithmetic number, because the mean of its divisors is an integer number (1387568).

Almost surely, 2^8721812 is an apocalyptic number.

It is an amenable number.

8721812 is a deficient number, since it is larger than the sum of its proper divisors (7929004).

8721812 is a wasteful number, since it uses less digits than its factorization.

8721812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198238 (or 198236 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 8721812 is about 2953.2714064237. The cubic root of 8721812 is about 205.8427492546.

The spelling of 8721812 in words is "eight million, seven hundred twenty-one thousand, eight hundred twelve".