391220832 has 96 divisors (see below), whose sum is σ = 1068221952. Its totient is φ = 125259264.

The previous prime is 391220827. The next prime is 391220867. The reversal of 391220832 is 238022193.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 391220832.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 294153 + ... + 295479.

It is an arithmetic number, because the mean of its divisors is an integer number (11127312).

Almost surely, 2^391220832 is an apocalyptic number.

391220832 is a gapful number since it is divisible by the number (32) 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 391220832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534110976).

391220832 is an abundant number, since it is smaller than the sum of its proper divisors (677001120).

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

391220832 is a wasteful number, since it uses less digits than its factorization.

391220832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1452 counting only the distinct ones).

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

The square root of 391220832 is about 19779.3031222033. The cubic root of 391220832 is about 731.3759200498.

The spelling of 391220832 in words is "three hundred ninety-one million, two hundred twenty thousand, eight hundred thirty-two".