904219 has 2 divisors, whose sum is σ = 904220. Its totient is φ = 904218.

The previous prime is 904217. The next prime is 904261. The reversal of 904219 is 912409.

It is a weak prime.

It is an emirp because it is prime and its reverse (912409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 904219 - 2¹ = 904217 is a prime.

It is a super-2 number, since 2×904219² = 1635223999922, which contains 22 as substring.

Together with 904217, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 904193 and 904202.

It is not a weakly prime, because it can be changed into another prime (904217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452109 + 452110.

It is an arithmetic number, because the mean of its divisors is an integer number (452110).

2⁹⁰⁴²¹⁹ is an apocalyptic number.

904219 is a deficient number, since it is larger than the sum of its proper divisors (1).

904219 is an equidigital number, since it uses as much as digits as its factorization.

904219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 904219 is about 950.9043064368. The cubic root of 904219 is about 96.6995699855.

The spelling of 904219 in words is "nine hundred four thousand, two hundred nineteen".