391341056 has 44 divisors (see below), whose sum is σ = 784942620. Its totient is φ = 195010560.

The previous prime is 391341053. The next prime is 391341059. The reversal of 391341056 is 650143193.

It is an interprime number because it is at equal distance from previous prime (391341053) and next prime (391341059).

It can be written as a sum of positive squares in 2 ways, for example, as 174662656 + 216678400 = 13216^2 + 14720^2 .

It is a super-2 number, since 2×391341056² = 306295644222390272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (391341053) 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, 471650 + ... + 472478.

It is an arithmetic number, because the mean of its divisors is an integer number (17839605).

Almost surely, 2^391341056 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 391341056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392471310).

391341056 is an abundant number, since it is smaller than the sum of its proper divisors (393601564).

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

391341056 is an equidigital number, since it uses as much as digits as its factorization.

391341056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 391341056 is about 19782.3420251496. The cubic root of 391341056 is about 731.4508307958.

The spelling of 391341056 in words is "three hundred ninety-one million, three hundred forty-one thousand, fifty-six".