391082340 has 96 divisors (see below), whose sum is σ = 1246565376. Its totient is φ = 90682240.

The previous prime is 391082327. The next prime is 391082359. The reversal of 391082340 is 43280193.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 391082298 and 391082307.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2299 + ... + 28061.

It is an arithmetic number, because the mean of its divisors is an integer number (12985056).

Almost surely, 2^391082340 is an apocalyptic number.

391082340 is a gapful number since it is divisible by the number (30) 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 391082340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (623282688).

391082340 is an abundant number, since it is smaller than the sum of its proper divisors (855483036).

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

391082340 is a wasteful number, since it uses less digits than its factorization.

391082340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25809 (or 25807 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 391082340 is about 19775.8018800756. The cubic root of 391082340 is about 731.2896076143.

The spelling of 391082340 in words is "three hundred ninety-one million, eighty-two thousand, three hundred forty".