391344128 has 52 divisors (see below), whose sum is σ = 894457200. Its totient is φ = 167706624.

The previous prime is 391344127. The next prime is 391344157. The reversal of 391344128 is 821443193.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391344127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21848 + ... + 35496.

It is an arithmetic number, because the mean of its divisors is an integer number (17201100).

Almost surely, 2^391344128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391344128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447228600).

391344128 is an abundant number, since it is smaller than the sum of its proper divisors (503113072).

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

391344128 is an equidigital number, since it uses as much as digits as its factorization.

391344128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13680 (or 13658 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 391344128 is about 19782.4196699999. The cubic root of 391344128 is about 731.4527447368.

The spelling of 391344128 in words is "three hundred ninety-one million, three hundred forty-four thousand, one hundred twenty-eight".