6872921 has 12 divisors (see below), whose sum is σ = 7660800. Its totient is φ = 6160440.

The previous prime is 6872911. The next prime is 6872933. The reversal of 6872921 is 1292786.

It is a happy number.

It is not a de Polignac number, because 6872921 - 2¹⁰ = 6871897 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6872911) 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, 9200 + ... + 9918.

It is an arithmetic number, because the mean of its divisors is an integer number (638400).

Almost surely, 2^6872921 is an apocalyptic number.

It is an amenable number.

6872921 is a deficient number, since it is larger than the sum of its proper divisors (787879).

6872921 is a wasteful number, since it uses less digits than its factorization.

6872921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820 (or 809 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 6872921 is about 2621.6256407046. The cubic root of 6872921 is about 190.1284542253.

The spelling of 6872921 in words is "six million, eight hundred seventy-two thousand, nine hundred twenty-one".