391349595252 has 384 divisors, whose sum is σ = 1193048801280. Its totient is φ = 96888960000.

The previous prime is 391349595229. The next prime is 391349595289. The reversal of 391349595252 is 252595943193.

It is a junction number, because it is equal to n+sod(n) for n = 391349595192 and 391349595201.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 651163752 + ... + 651164352.

It is an arithmetic number, because the mean of its divisors is an integer number (3106897920).

Almost surely, 2^391349595252 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 391349595252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (596524400640).

391349595252 is an abundant number, since it is smaller than the sum of its proper divisors (801699206028).

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

391349595252 is a wasteful number, since it uses less digits than its factorization.

391349595252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 961 counting only the distinct ones).

The product of its digits is 13122000, while the sum is 57.

The spelling of 391349595252 in words is "three hundred ninety-one billion, three hundred forty-nine million, five hundred ninety-five thousand, two hundred fifty-two".