8421705 has 16 divisors (see below), whose sum is σ = 14972160. Its totient is φ = 4491504.

The previous prime is 8421701. The next prime is 8421709. The reversal of 8421705 is 5071248.

8421705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8421701) and next prime (8421709).

It is not a de Polignac number, because 8421705 - 2² = 8421701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (8421701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31057 + ... + 31326.

It is an arithmetic number, because the mean of its divisors is an integer number (935760).

Almost surely, 2^8421705 is an apocalyptic number.

It is an amenable number.

8421705 is a deficient number, since it is larger than the sum of its proper divisors (6550455).

8421705 is a wasteful number, since it uses less digits than its factorization.

8421705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62397 (or 62391 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 8421705 is about 2902.0174017397. The cubic root of 8421705 is about 203.4542071479.

The spelling of 8421705 in words is "eight million, four hundred twenty-one thousand, seven hundred five".