1868118920 has 32 divisors (see below), whose sum is σ = 4218917400. Its totient is φ = 744465408.

The previous prime is 1868118887. The next prime is 1868118929. The reversal of 1868118920 is 298118681.

It can be written as a sum of positive squares in 4 ways, for example, as 1117030084 + 751088836 = 33422^2 + 27406^2 .

It is not an unprimeable number, because it can be changed into a prime (1868118929) by changing a digit.

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, 76049 + ... + 97568.

Almost surely, 2^1868118920 is an apocalyptic number.

1868118920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1868118920 is an abundant number, since it is smaller than the sum of its proper divisors (2350798480).

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

1868118920 is a wasteful number, since it uses less digits than its factorization.

1868118920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173897 (or 173893 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 44.

The square root of 1868118920 is about 43221.7412883840. The cubic root of 1868118920 is about 1231.5957256353.

The spelling of 1868118920 in words is "one billion, eight hundred sixty-eight million, one hundred eighteen thousand, nine hundred twenty".