840491550 has 144 divisors (see below), whose sum is σ = 2334491952. Its totient is φ = 216691200.

The previous prime is 840491549. The next prime is 840491551. The reversal of 840491550 is 55194048.

It is an interprime number because it is at equal distance from previous prime (840491549) and next prime (840491551).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840491551) 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 71 ways as a sum of consecutive naturals, for example, 1838922 + ... + 1839378.

Almost surely, 2^840491550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840491550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1167245976).

840491550 is an abundant number, since it is smaller than the sum of its proper divisors (1494000402).

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

840491550 is a wasteful number, since it uses less digits than its factorization.

840491550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 595 counting only the distinct ones).

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

The square root of 840491550 is about 28991.2322952992. The cubic root of 840491550 is about 943.7228064033.

The spelling of 840491550 in words is "eight hundred forty million, four hundred ninety-one thousand, five hundred fifty".