391425531280 has 160 divisors (see below), whose sum is σ = 1095254899200. Its totient is φ = 127189979136.

The previous prime is 391425531247. The next prime is 391425531283. The reversal of 391425531280 is 82135524193.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (391425531283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1264516 + ... + 1543324.

It is an arithmetic number, because the mean of its divisors is an integer number (6845343120).

Almost surely, 2^391425531280 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 391425531280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547627449600).

391425531280 is an abundant number, since it is smaller than the sum of its proper divisors (703829367920).

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

391425531280 is a wasteful number, since it uses less digits than its factorization.

391425531280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278961 (or 278955 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 391425531280 in words is "three hundred ninety-one billion, four hundred twenty-five million, five hundred thirty-one thousand, two hundred eighty".