8420105 has 8 divisors (see below), whose sum is σ = 10120200. Its totient is φ = 6725376.

The previous prime is 8420051. The next prime is 8420119. The reversal of 8420105 is 5010248.

It can be written as a sum of positive squares in 4 ways, for example, as 473344 + 7946761 = 688^2 + 2819^2 .

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 8420105 - 2¹⁴ = 8403721 is a prime.

It is a super-2 number, since 2×8420105² = 141796336422050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4211 + ... + 5879.

It is an arithmetic number, because the mean of its divisors is an integer number (1265025).

Almost surely, 2^8420105 is an apocalyptic number.

It is an amenable number.

8420105 is a deficient number, since it is larger than the sum of its proper divisors (1700095).

8420105 is a wasteful number, since it uses less digits than its factorization.

8420105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 8420105 is about 2901.7417183478. The cubic root of 8420105 is about 203.4413218969.

The spelling of 8420105 in words is "eight million, four hundred twenty thousand, one hundred five".