1918878885 has 48 divisors (see below), whose sum is σ = 4146779520. Its totient is φ = 797454720.

The previous prime is 1918878881. The next prime is 1918878887. The reversal of 1918878885 is 5888788191.

It is not a de Polignac number, because 1918878885 - 2² = 1918878881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918878881) 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 47 ways as a sum of consecutive naturals, for example, 273430 + ... + 280359.

It is an arithmetic number, because the mean of its divisors is an integer number (86391240).

Almost surely, 2^1918878885 is an apocalyptic number.

1918878885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1918878885 is an abundant number, since it is smaller than the sum of its proper divisors (2227900635).

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

1918878885 is a wasteful number, since it uses less digits than its factorization.

1918878885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553818 (or 553815 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 63.

The square root of 1918878885 is about 43805.0098162299. The cubic root of 1918878885 is about 1242.6510410465.

The spelling of 1918878885 in words is "one billion, nine hundred eighteen million, eight hundred seventy-eight thousand, eight hundred eighty-five".