1851321868 has 24 divisors (see below), whose sum is σ = 3561332544. Its totient is φ = 835083600.

The previous prime is 1851321851. The next prime is 1851321877. The reversal of 1851321868 is 8681231581.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154830 + ... + 166357.

It is an arithmetic number, because the mean of its divisors is an integer number (148388856).

Almost surely, 2^1851321868 is an apocalyptic number.

It is an amenable number.

1851321868 is a deficient number, since it is larger than the sum of its proper divisors (1710010676).

1851321868 is a wasteful number, since it uses less digits than its factorization.

1851321868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321333 (or 321331 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 1851321868 is about 43026.9899946534. The cubic root of 1851321868 is about 1227.8933397371.

The spelling of 1851321868 in words is "one billion, eight hundred fifty-one million, three hundred twenty-one thousand, eight hundred sixty-eight".