1949973818 has 16 divisors (see below), whose sum is σ = 3155241600. Its totient is φ = 898478256.

The previous prime is 1949973793. The next prime is 1949973859. The reversal of 1949973818 is 8183799491.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47030 + ... + 78177.

It is an arithmetic number, because the mean of its divisors is an integer number (197202600).

Almost surely, 2^1949973818 is an apocalyptic number.

1949973818 is a deficient number, since it is larger than the sum of its proper divisors (1205267782).

1949973818 is a wasteful number, since it uses less digits than its factorization.

1949973818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125821.

The product of its digits is 3919104, while the sum is 59.

The square root of 1949973818 is about 44158.5078778711. The cubic root of 1949973818 is about 1249.3273859772.

The spelling of 1949973818 in words is "one billion, nine hundred forty-nine million, nine hundred seventy-three thousand, eight hundred eighteen".