1918934064 has 120 divisors (see below), whose sum is σ = 5646378192. Its totient is φ = 630789120.

The previous prime is 1918934063. The next prime is 1918934081. The reversal of 1918934064 is 4604398191.

It is not an unprimeable number, because it can be changed into a prime (1918934063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280444 + ... + 287204.

Almost surely, 2^1918934064 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 1918934064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2823189096).

1918934064 is an abundant number, since it is smaller than the sum of its proper divisors (3727444128).

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

1918934064 is an equidigital number, since it uses as much as digits as its factorization.

1918934064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6857 (or 6839 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 1918934064 is about 43805.6396369235. The cubic root of 1918934064 is about 1242.6629520960.

The spelling of 1918934064 in words is "one billion, nine hundred eighteen million, nine hundred thirty-four thousand, sixty-four".