8670921 has 8 divisors (see below), whose sum is σ = 13212864. Its totient is φ = 4954800.

The previous prime is 8670919. The next prime is 8670941. The reversal of 8670921 is 1290768.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8670921 - 2¹ = 8670919 is a prime.

8670921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8670941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206430 + ... + 206471.

It is an arithmetic number, because the mean of its divisors is an integer number (1651608).

Almost surely, 2^8670921 is an apocalyptic number.

It is an amenable number.

8670921 is a deficient number, since it is larger than the sum of its proper divisors (4541943).

8670921 is a wasteful number, since it uses less digits than its factorization.

8670921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412911.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 8670921 is about 2944.6427627133. The cubic root of 8670921 is about 205.4416099700.

It can be divided in two parts, 8670 and 921, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 8670921 in words is "eight million, six hundred seventy thousand, nine hundred twenty-one".