391209789312 has 128 divisors (see below), whose sum is σ = 1155651840000. Its totient is φ = 130285850112.

The previous prime is 391209789301. The next prime is 391209789317. The reversal of 391209789312 is 213987902193.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391209789317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3830689 + ... + 3931487.

It is an arithmetic number, because the mean of its divisors is an integer number (9028530000).

Almost surely, 2^391209789312 is an apocalyptic number.

391209789312 is a gapful number since it is divisible by the number (32) 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 391209789312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577825920000).

391209789312 is an abundant number, since it is smaller than the sum of its proper divisors (764442050688).

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

391209789312 is a wasteful number, since it uses less digits than its factorization.

391209789312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101945 (or 101927 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 391209789312 in words is "three hundred ninety-one billion, two hundred nine million, seven hundred eighty-nine thousand, three hundred twelve".