8121872 has 20 divisors (see below), whose sum is σ = 17167056. Its totient is φ = 3691680.

The previous prime is 8121871. The next prime is 8121877. The reversal of 8121872 is 2781218.

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

It is not an unprimeable number, because it can be changed into a prime (8121871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22898 + ... + 23249.

Almost surely, 2^8121872 is an apocalyptic number.

It is an amenable number.

8121872 is an abundant number, since it is smaller than the sum of its proper divisors (9045184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8121872 is a wasteful number, since it uses less digits than its factorization.

8121872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46166 (or 46160 counting only the distinct ones).

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

The square root of 8121872 is about 2849.8898224317. The cubic root of 8121872 is about 201.0104859921.

The spelling of 8121872 in words is "eight million, one hundred twenty-one thousand, eight hundred seventy-two".