8617421 has 8 divisors (see below), whose sum is σ = 8919288. Its totient is φ = 8320000.

The previous prime is 8617417. The next prime is 8617439. The reversal of 8617421 is 1247168.

It can be written as a sum of positive squares in 4 ways, for example, as 972196 + 7645225 = 986^2 + 2765^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8617421 - 2² = 8617417 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 (8613421) 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, 3101 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (1114911).

Almost surely, 2^8617421 is an apocalyptic number.

It is an amenable number.

8617421 is a deficient number, since it is larger than the sum of its proper divisors (301867).

8617421 is a wasteful number, since it uses less digits than its factorization.

8617421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223.

The product of its digits is 2688, while the sum is 29.

The square root of 8617421 is about 2935.5444128815. The cubic root of 8617421 is about 205.0182097645.

The spelling of 8617421 in words is "eight million, six hundred seventeen thousand, four hundred twenty-one".