391848240 has 160 divisors (see below), whose sum is σ = 1448764416. Its totient is φ = 85662720.

The previous prime is 391848211. The next prime is 391848257. The reversal of 391848240 is 42848193.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33570 + ... + 43710.

Almost surely, 2^391848240 is an apocalyptic number.

391848240 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 391848240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724382208).

391848240 is an abundant number, since it is smaller than the sum of its proper divisors (1056916176).

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

391848240 is a wasteful number, since it uses less digits than its factorization.

391848240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10187 (or 10181 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 391848240 is about 19795.1569834644. The cubic root of 391848240 is about 731.7666848762.

The spelling of 391848240 in words is "three hundred ninety-one million, eight hundred forty-eight thousand, two hundred forty".