8121447 has 12 divisors (see below), whose sum is σ = 11846224. Its totient is φ = 5361120.

The previous prime is 8121439. The next prime is 8121499. The reversal of 8121447 is 7441218.

It is not a de Polignac number, because 8121447 - 2³ = 8121439 is a prime.

It is a Duffinian number.

8121447 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8121447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8121847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3454 + ... + 5307.

Almost surely, 2^8121447 is an apocalyptic number.

8121447 is a deficient number, since it is larger than the sum of its proper divisors (3724777).

8121447 is a wasteful number, since it uses less digits than its factorization.

8121447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870 (or 8867 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 8121447 is about 2849.8152571702. The cubic root of 8121447 is about 201.0069797829.

It can be divided in two parts, 81 and 21447, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 8121447 in words is "eight million, one hundred twenty-one thousand, four hundred forty-seven".