195615840 has 144 divisors (see below), whose sum is σ = 716878512. Its totient is φ = 44706816.

The previous prime is 195615829. The next prime is 195615899. The reversal of 195615840 is 48516591.

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, 19362 + ... + 27678.

It is an arithmetic number, because the mean of its divisors is an integer number (4978323).

Almost surely, 2^195615840 is an apocalyptic number.

195615840 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 195615840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358439256).

195615840 is an abundant number, since it is smaller than the sum of its proper divisors (521262672).

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

195615840 is a wasteful number, since it uses less digits than its factorization.

195615840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8349 (or 8334 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 195615840 is about 13986.2732706036. The cubic root of 195615840 is about 580.4988178066.

The spelling of 195615840 in words is "one hundred ninety-five million, six hundred fifteen thousand, eight hundred forty".