840419505 has 12 divisors (see below), whose sum is σ = 1456727220. Its totient is φ = 448223712.

The previous prime is 840419501. The next prime is 840419519. The reversal of 840419505 is 505914048.

It can be written as a sum of positive squares in 2 ways, for example, as 343842849 + 496576656 = 18543^2 + 22284^2 .

It is not a de Polignac number, because 840419505 - 2² = 840419501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840419505.

It is not an unprimeable number, because it can be changed into a prime (840419501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9337950 + ... + 9338039.

It is an arithmetic number, because the mean of its divisors is an integer number (121393935).

Almost surely, 2^840419505 is an apocalyptic number.

It is an amenable number.

840419505 is a deficient number, since it is larger than the sum of its proper divisors (616307715).

840419505 is a wasteful number, since it uses less digits than its factorization.

840419505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18676000 (or 18675997 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 840419505 is about 28989.9897378388. The cubic root of 840419505 is about 943.6958410509.

The spelling of 840419505 in words is "eight hundred forty million, four hundred nineteen thousand, five hundred five".