1918238380 has 24 divisors (see below), whose sum is σ = 4057710048. Its totient is φ = 761693568.

The previous prime is 1918238363. The next prime is 1918238407. The reversal of 1918238380 is 838328191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347304 + ... + 352783.

It is an arithmetic number, because the mean of its divisors is an integer number (169071252).

Almost surely, 2^1918238380 is an apocalyptic number.

1918238380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1918238380 is an abundant number, since it is smaller than the sum of its proper divisors (2139471668).

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

1918238380 is a wasteful number, since it uses less digits than its factorization.

1918238380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700233 (or 700231 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 1918238380 is about 43797.6983413512. The cubic root of 1918238380 is about 1242.5127636413.

The spelling of 1918238380 in words is "one billion, nine hundred eighteen million, two hundred thirty-eight thousand, three hundred eighty".