1918160640 has 216 divisors, whose sum is σ = 7240444848. Its totient is φ = 464977920.

The previous prime is 1918160639. The next prime is 1918160689. The reversal of 1918160640 is 460618191.

It is a happy number.

1918160640 is a `hidden beast` number, since 1 + 9 + 1 + 8 + 1 + 6 + 0 + 640 = 666.

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 = 1918160595 and 1918160604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119152 + ... + 134288.

It is an arithmetic number, because the mean of its divisors is an integer number (33520578).

Almost surely, 2^1918160640 is an apocalyptic number.

1918160640 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 1918160640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3620222424).

1918160640 is an abundant number, since it is smaller than the sum of its proper divisors (5322284208).

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

1918160640 is a wasteful number, since it uses less digits than its factorization.

1918160640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15175 (or 15158 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1918160640 is about 43796.8108428000. The cubic root of 1918160640 is about 1242.4959784061.

The spelling of 1918160640 in words is "one billion, nine hundred eighteen million, one hundred sixty thousand, six hundred forty".