840251980 has 24 divisors (see below), whose sum is σ = 1765693440. Its totient is φ = 335879040.

The previous prime is 840251969. The next prime is 840251987. The reversal of 840251980 is 89152048.

It is not an unprimeable number, because it can be changed into a prime (840251987) 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 7 ways as a sum of consecutive naturals, for example, 19125 + ... + 45235.

It is an arithmetic number, because the mean of its divisors is an integer number (73570560).

Almost surely, 2^840251980 is an apocalyptic number.

It is an amenable number.

840251980 is an abundant number, since it is smaller than the sum of its proper divisors (925441460).

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

840251980 is a wasteful number, since it uses less digits than its factorization.

840251980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27729 (or 27727 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 840251980 is about 28987.1002344146. The cubic root of 840251980 is about 943.6331330222.

The spelling of 840251980 in words is "eight hundred forty million, two hundred fifty-one thousand, nine hundred eighty".