8420919 has 8 divisors (see below), whose sum is σ = 12091632. Its totient is φ = 5182080.

The previous prime is 8420917. The next prime is 8420927. The reversal of 8420919 is 9190248.

8420919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8420919 - 2¹ = 8420917 is a prime.

It is a super-2 number, since 2×8420919² = 141823753609122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8420919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107922 + ... + 107999.

It is an arithmetic number, because the mean of its divisors is an integer number (1511454).

Almost surely, 2^8420919 is an apocalyptic number.

8420919 is a deficient number, since it is larger than the sum of its proper divisors (3670713).

8420919 is a wasteful number, since it uses less digits than its factorization.

8420919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215937.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 8420919 is about 2901.8819755462. The cubic root of 8420919 is about 203.4478774723.

It can be divided in two parts, 8420 and 919, that added together give a palindrome (9339).

The spelling of 8420919 in words is "eight million, four hundred twenty thousand, nine hundred nineteen".