1918984320 has 384 divisors, whose sum is σ = 7469729280. Its totient is φ = 449740800.

The previous prime is 1918984307. The next prime is 1918984321. The reversal of 1918984320 is 234898191.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1918984321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1963672 + ... + 1964648.

It is an arithmetic number, because the mean of its divisors is an integer number (19452420).

Almost surely, 2^1918984320 is an apocalyptic number.

1918984320 is a gapful number since it is divisible by the number (10) 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 1918984320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3734864640).

1918984320 is an abundant number, since it is smaller than the sum of its proper divisors (5550744960).

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

1918984320 is a wasteful number, since it uses less digits than its factorization.

1918984320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1918984320 is about 43806.2132579387. The cubic root of 1918984320 is about 1242.6738002583.

The spelling of 1918984320 in words is "one billion, nine hundred eighteen million, nine hundred eighty-four thousand, three hundred twenty".