391604240 has 80 divisors (see below), whose sum is σ = 933422400. Its totient is φ = 152741376.

The previous prime is 391604237. The next prime is 391604261. The reversal of 391604240 is 42406193.

It is a tau number, because it is divible by the number of its divisors (80).

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, 769106 + ... + 769614.

It is an arithmetic number, because the mean of its divisors is an integer number (11667780).

Almost surely, 2^391604240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391604240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (466711200).

391604240 is an abundant number, since it is smaller than the sum of its proper divisors (541818160).

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

391604240 is a wasteful number, since it uses less digits than its factorization.

391604240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 391604240 is about 19788.9929000947. The cubic root of 391604240 is about 731.6147653945.

The spelling of 391604240 in words is "three hundred ninety-one million, six hundred four thousand, two hundred forty".