844778419 has 2 divisors, whose sum is σ = 844778420. Its totient is φ = 844778418.

The previous prime is 844778371. The next prime is 844778471. The reversal of 844778419 is 914877448.

It is a happy number.

It is an a-pointer prime, because the next prime (844778471) can be obtained adding 844778419 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844778419 is a prime.

It is a super-2 number, since 2×844778419² = 1427301154416279122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (844278419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422389209 + 422389210.

It is an arithmetic number, because the mean of its divisors is an integer number (422389210).

Almost surely, 2^844778419 is an apocalyptic number.

844778419 is a deficient number, since it is larger than the sum of its proper divisors (1).

844778419 is an equidigital number, since it uses as much as digits as its factorization.

844778419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 52.

The square root of 844778419 is about 29065.0721485428. The cubic root of 844778419 is about 945.3245505805.

The spelling of 844778419 in words is "eight hundred forty-four million, seven hundred seventy-eight thousand, four hundred nineteen".