1918290816 has 128 divisors (see below), whose sum is σ = 6097274400. Its totient is φ = 590229504.

The previous prime is 1918290809. The next prime is 1918290817. The reversal of 1918290816 is 6180928191.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918290817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23580 + ... + 66276.

Almost surely, 2^1918290816 is an apocalyptic number.

1918290816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918290816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3048637200).

1918290816 is an abundant number, since it is smaller than the sum of its proper divisors (4178983584).

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

1918290816 is a wasteful number, since it uses less digits than its factorization.

1918290816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42733 (or 42715 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The square root of 1918290816 is about 43798.2969531921. The cubic root of 1918290816 is about 1242.5240851063.

The spelling of 1918290816 in words is "one billion, nine hundred eighteen million, two hundred ninety thousand, eight hundred sixteen".