1868955816 has 128 divisors (see below), whose sum is σ = 5802289920. Its totient is φ = 488484864.

The previous prime is 1868955793. The next prime is 1868955833. The reversal of 1868955816 is 6185598681.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243006 + ... + 250578.

It is an arithmetic number, because the mean of its divisors is an integer number (45330390).

Almost surely, 2^1868955816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868955816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2901144960).

1868955816 is an abundant number, since it is smaller than the sum of its proper divisors (3933334104).

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

1868955816 is a wasteful number, since it uses less digits than its factorization.

1868955816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715 (or 7711 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 57.

The square root of 1868955816 is about 43231.4216282555. The cubic root of 1868955816 is about 1231.7796117979.

The spelling of 1868955816 in words is "one billion, eight hundred sixty-eight million, nine hundred fifty-five thousand, eight hundred sixteen".