1918141440 has 176 divisors, whose sum is σ = 6267946752. Its totient is φ = 500432896.

The previous prime is 1918141429. The next prime is 1918141441. The reversal of 1918141440 is 441418191.

It is not an unprimeable number, because it can be changed into a prime (1918141441) 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, 720592 + ... + 723248.

Almost surely, 2^1918141440 is an apocalyptic number.

1918141440 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 1918141440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3133973376).

1918141440 is an abundant number, since it is smaller than the sum of its proper divisors (4349805312).

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

1918141440 is a wasteful number, since it uses less digits than its factorization.

1918141440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1918141440 is about 43796.5916482093. The cubic root of 1918141440 is about 1242.4918327675.

The spelling of 1918141440 in words is "one billion, nine hundred eighteen million, one hundred forty-one thousand, four hundred forty".