1917794340 has 432 divisors, whose sum is σ = 7641648000. Its totient is φ = 397837440.

The previous prime is 1917794321. The next prime is 1917794353. The reversal of 1917794340 is 434977191.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3201361 + ... + 3201959.

It is an arithmetic number, because the mean of its divisors is an integer number (17689000).

Almost surely, 2^1917794340 is an apocalyptic number.

1917794340 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 1917794340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3820824000).

1917794340 is an abundant number, since it is smaller than the sum of its proper divisors (5723853660).

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

1917794340 is a wasteful number, since it uses less digits than its factorization.

1917794340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 1917794340 is about 43792.6288318023. The cubic root of 1917794340 is about 1242.4168826235.

The spelling of 1917794340 in words is "one billion, nine hundred seventeen million, seven hundred ninety-four thousand, three hundred forty".