8672921 has 4 divisors (see below), whose sum is σ = 8688000. Its totient is φ = 8657844.

The previous prime is 8672897. The next prime is 8672927. The reversal of 8672921 is 1292768.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8672921 - 2¹⁴ = 8656537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8672927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641 + ... + 7838.

It is an arithmetic number, because the mean of its divisors is an integer number (2172000).

Almost surely, 2^8672921 is an apocalyptic number.

It is an amenable number.

8672921 is a deficient number, since it is larger than the sum of its proper divisors (15079).

8672921 is a wasteful number, since it uses less digits than its factorization.

8672921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078.

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

The square root of 8672921 is about 2944.9823429012. The cubic root of 8672921 is about 205.4574042027.

The spelling of 8672921 in words is "eight million, six hundred seventy-two thousand, nine hundred twenty-one".