840491420 has 48 divisors (see below), whose sum is σ = 1800338400. Its totient is φ = 329539584.

The previous prime is 840491411. The next prime is 840491423. The reversal of 840491420 is 24194048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840491423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205556 + ... + 209604.

It is an arithmetic number, because the mean of its divisors is an integer number (37507050).

Almost surely, 2^840491420 is an apocalyptic number.

It is an amenable number.

840491420 is an abundant number, since it is smaller than the sum of its proper divisors (959846980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840491420 is a wasteful number, since it uses less digits than its factorization.

840491420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 840491420 is about 28991.2300532420. The cubic root of 840491420 is about 943.7227577476.

The spelling of 840491420 in words is "eight hundred forty million, four hundred ninety-one thousand, four hundred twenty".