391116330 has 256 divisors, whose sum is σ = 1244160000. Its totient is φ = 86365440.

The previous prime is 391116293. The next prime is 391116337. The reversal of 391116330 is 33611193.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 391116294 and 391116303.

It is not an unprimeable number, because it can be changed into a prime (391116337) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1636351 + ... + 1636589.

It is an arithmetic number, because the mean of its divisors is an integer number (4860000).

Almost surely, 2^391116330 is an apocalyptic number.

391116330 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 391116330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (622080000).

391116330 is an abundant number, since it is smaller than the sum of its proper divisors (853043670).

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

391116330 is a wasteful number, since it uses less digits than its factorization.

391116330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 308 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 391116330 is about 19776.6612450130. The cubic root of 391116330 is about 731.3107931049.

It can be divided in two parts, 3911163 and 30, that added together give a palindrome (3911193).

The spelling of 391116330 in words is "three hundred ninety-one million, one hundred sixteen thousand, three hundred thirty".