391640848 has 40 divisors (see below), whose sum is σ = 780307200. Its totient is φ = 190329600.

The previous prime is 391640831. The next prime is 391640867. The reversal of 391640848 is 848046193.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111828 + ... + 115276.

It is an arithmetic number, because the mean of its divisors is an integer number (19507680).

Almost surely, 2^391640848 is an apocalyptic number.

It is an amenable number.

391640848 is a deficient number, since it is larger than the sum of its proper divisors (388666352).

391640848 is a wasteful number, since it uses less digits than its factorization.

391640848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655 (or 3649 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 391640848 is about 19789.9178371210. The cubic root of 391640848 is about 731.6375623206.

The spelling of 391640848 in words is "three hundred ninety-one million, six hundred forty thousand, eight hundred forty-eight".