1868721788 has 12 divisors (see below), whose sum is σ = 3375755712. Its totient is φ = 904220160.

The previous prime is 1868721769. The next prime is 1868721797. The reversal of 1868721788 is 8871278681.

It is a super-2 number, since 2×1868721788² = 6984242241891833888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7535045 + ... + 7535292.

It is an arithmetic number, because the mean of its divisors is an integer number (281312976).

Almost surely, 2^1868721788 is an apocalyptic number.

It is an amenable number.

1868721788 is a deficient number, since it is larger than the sum of its proper divisors (1507033924).

1868721788 is a wasteful number, since it uses less digits than its factorization.

1868721788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15070372 (or 15070370 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 56.

The square root of 1868721788 is about 43228.7148548277. The cubic root of 1868721788 is about 1231.7281957523.

The spelling of 1868721788 in words is "one billion, eight hundred sixty-eight million, seven hundred twenty-one thousand, seven hundred eighty-eight".