8420929 has 4 divisors (see below), whose sum is σ = 9186480. Its totient is φ = 7655380.

The previous prime is 8420927. The next prime is 8420939. The reversal of 8420929 is 9290248.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8420929 - 2¹ = 8420927 is a prime.

It is an Ulam number.

It is a Duffinian number.

8420929 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8420894 and 8420903.

It is not an unprimeable number, because it can be changed into a prime (8420927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382759 + ... + 382780.

It is an arithmetic number, because the mean of its divisors is an integer number (2296620).

Almost surely, 2^8420929 is an apocalyptic number.

It is an amenable number.

8420929 is a deficient number, since it is larger than the sum of its proper divisors (765551).

8420929 is a wasteful number, since it uses less digits than its factorization.

8420929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765550.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 8420929 is about 2901.8836985655. The cubic root of 8420929 is about 203.4479580050.

The spelling of 8420929 in words is "eight million, four hundred twenty thousand, nine hundred twenty-nine".