1918326240 has 240 divisors, whose sum is σ = 7169157072. Its totient is φ = 481406976.

The previous prime is 1918326239. The next prime is 1918326251. The reversal of 1918326240 is 426238191.

1918326240 is a `hidden beast` number, since 1 + 91 + 8 + 326 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1918326195 and 1918326204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 215967 + ... + 224673.

Almost surely, 2^1918326240 is an apocalyptic number.

1918326240 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 1918326240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3584578536).

1918326240 is an abundant number, since it is smaller than the sum of its proper divisors (5250830832).

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

1918326240 is a wasteful number, since it uses less digits than its factorization.

1918326240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751 (or 8734 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1918326240 is about 43798.7013506108. The cubic root of 1918326240 is about 1242.5317333908.

The spelling of 1918326240 in words is "one billion, nine hundred eighteen million, three hundred twenty-six thousand, two hundred forty".