1649743180 has 24 divisors (see below), whose sum is σ = 3465226800. Its totient is φ = 659751360.

The previous prime is 1649743169. The next prime is 1649743187. The reversal of 1649743180 is 813479461.

It is not an unprimeable number, because it can be changed into a prime (1649743187) 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, 160846 + ... + 170794.

It is an arithmetic number, because the mean of its divisors is an integer number (144384450).

Almost surely, 2^1649743180 is an apocalyptic number.

1649743180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649743180 is an abundant number, since it is smaller than the sum of its proper divisors (1815483620).

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

1649743180 is a wasteful number, since it uses less digits than its factorization.

1649743180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18249 (or 18247 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 1649743180 is about 40617.0306644885. The cubic root of 1649743180 is about 1181.6044391252.

The spelling of 1649743180 in words is "one billion, six hundred forty-nine million, seven hundred forty-three thousand, one hundred eighty".