193808640 has 144 divisors (see below), whose sum is σ = 634588416. Its totient is φ = 50380800.

The previous prime is 193808639. The next prime is 193808647. The reversal of 193808640 is 46808391.

It is not an unprimeable number, because it can be changed into a prime (193808647) 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, 156825 + ... + 158055.

It is an arithmetic number, because the mean of its divisors is an integer number (4406864).

Almost surely, 2^193808640 is an apocalyptic number.

193808640 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 193808640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317294208).

193808640 is an abundant number, since it is smaller than the sum of its proper divisors (440779776).

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

193808640 is a wasteful number, since it uses less digits than its factorization.

193808640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296 (or 1282 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 193808640 is about 13921.5171587008. The cubic root of 193808640 is about 578.7056351633.

The spelling of 193808640 in words is "one hundred ninety-three million, eight hundred eight thousand, six hundred forty".