1868913887 has 8 divisors (see below), whose sum is σ = 1980212832. Its totient is φ = 1757766400.

The previous prime is 1868913881. The next prime is 1868913899. The reversal of 1868913887 is 7883198681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868913887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868913881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11939 + ... + 62292.

It is an arithmetic number, because the mean of its divisors is an integer number (247526604).

Almost surely, 2^1868913887 is an apocalyptic number.

1868913887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1868913887 is a deficient number, since it is larger than the sum of its proper divisors (111298945).

1868913887 is a wasteful number, since it uses less digits than its factorization.

1868913887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75729.

The product of its digits is 4644864, while the sum is 59.

The square root of 1868913887 is about 43230.9366889037. The cubic root of 1868913887 is about 1231.7704002954.

The spelling of 1868913887 in words is "one billion, eight hundred sixty-eight million, nine hundred thirteen thousand, eight hundred eighty-seven".