8420479 has 4 divisors (see below), whose sum is σ = 8433880. Its totient is φ = 8407080.

The previous prime is 8420453. The next prime is 8420483. The reversal of 8420479 is 9740248.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8420479 - 2⁷ = 8420351 is a prime.

It is a Duffinian number.

8420479 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5709 + ... + 7030.

It is an arithmetic number, because the mean of its divisors is an integer number (2108470).

Almost surely, 2^8420479 is an apocalyptic number.

8420479 is a deficient number, since it is larger than the sum of its proper divisors (13401).

8420479 is a wasteful number, since it uses less digits than its factorization.

8420479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13400.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 8420479 is about 2901.8061616862. The cubic root of 8420479 is about 203.4443339705. Note that the first 3 decimals are identical.

The spelling of 8420479 in words is "eight million, four hundred twenty thousand, four hundred seventy-nine".