128522394 has 144 divisors (see below), whose sum is σ = 380933280. Its totient is φ = 30784320.

The previous prime is 128522371. The next prime is 128522417. The reversal of 128522394 is 493225821.

It is a happy number.

128522394 is a `hidden beast` number, since 128 + 522 + 3 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (128522371) and next prime (128522417).

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 71 ways as a sum of consecutive naturals, for example, 125617 + ... + 126635.

It is an arithmetic number, because the mean of its divisors is an integer number (2645370).

Almost surely, 2^128522394 is an apocalyptic number.

128522394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128522394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190466640).

128522394 is an abundant number, since it is smaller than the sum of its proper divisors (252410886).

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

128522394 is a wasteful number, since it uses less digits than its factorization.

128522394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065 (or 1055 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 128522394 is about 11336.7717627198. The cubic root of 128522394 is about 504.6530885406.

The spelling of 128522394 in words is "one hundred twenty-eight million, five hundred twenty-two thousand, three hundred ninety-four".