391322273792 has 108 divisors (see below), whose sum is σ = 819315556605. Its totient is φ = 186842726400.

The previous prime is 391322273773. The next prime is 391322273821. The reversal of 391322273792 is 297372223193.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 338928894976 + 52393378816 = 582176^2 + 228896^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=442336.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391322273792.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 651118292 + ... + 651118892.

Almost surely, 2^391322273792 is an apocalyptic number.

391322273792 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 391322273792

391322273792 is an abundant number, since it is smaller than the sum of its proper divisors (427993282813).

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

391322273792 is an frugal number, since it uses more digits than its factorization.

391322273792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 626 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 50.

Multiplying 391322273792 by its sum of digits (50), we get a square (19566113689600 = 4423360²).

The spelling of 391322273792 in words is "three hundred ninety-one billion, three hundred twenty-two million, two hundred seventy-three thousand, seven hundred ninety-two".