195128388 has 216 divisors, whose sum is σ = 632067072. Its totient is φ = 50295168.

The previous prime is 195128383. The next prime is 195128393. The reversal of 195128388 is 883821591.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (195128383) and next prime (195128393).

It is not an unprimeable number, because it can be changed into a prime (195128383) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1536381 + ... + 1536507.

Almost surely, 2^195128388 is an apocalyptic number.

195128388 is a gapful number since it is divisible by the number (18) 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 195128388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316033536).

195128388 is an abundant number, since it is smaller than the sum of its proper divisors (436938684).

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

195128388 is a wasteful number, since it uses less digits than its factorization.

195128388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 219 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 195128388 is about 13968.8363151696. The cubic root of 195128388 is about 580.0162381502.

The spelling of 195128388 in words is "one hundred ninety-five million, one hundred twenty-eight thousand, three hundred eighty-eight".