391842440 has 32 divisors (see below), whose sum is σ = 961796160. Its totient is φ = 142488000.

The previous prime is 391842349. The next prime is 391842487. The reversal of 391842440 is 44248193.

It is a self number, because there is not a number n which added to its sum of digits gives 391842440.

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 7 ways as a sum of consecutive naturals, for example, 444836 + ... + 445715.

It is an arithmetic number, because the mean of its divisors is an integer number (30056130).

Almost surely, 2^391842440 is an apocalyptic number.

It is an amenable number.

391842440 is an abundant number, since it is smaller than the sum of its proper divisors (569953720).

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

391842440 is a wasteful number, since it uses less digits than its factorization.

391842440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890573 (or 890569 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 391842440 is about 19795.0104824423. The cubic root of 391842440 is about 731.7630744073.

The spelling of 391842440 in words is "three hundred ninety-one million, eight hundred forty-two thousand, four hundred forty".