8420705 has 16 divisors (see below), whose sum is σ = 10730880. Its totient is φ = 6325632.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420705 is 5070248.

It is not a de Polignac number, because 8420705 - 2⁸ = 8420449 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12692 + ... + 13338.

It is an arithmetic number, because the mean of its divisors is an integer number (670680).

Almost surely, 2^8420705 is an apocalyptic number.

It is an amenable number.

8420705 is a deficient number, since it is larger than the sum of its proper divisors (2310175).

8420705 is a wasteful number, since it uses less digits than its factorization.

8420705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 8420705 is about 2901.8451026890. The cubic root of 8420705 is about 203.4461540573.

The spelling of 8420705 in words is "eight million, four hundred twenty thousand, seven hundred five".