791440 has 40 divisors (see below), whose sum is σ = 1984248. Its totient is φ = 291840.

The previous prime is 791431. The next prime is 791443. The reversal of 791440 is 44197.

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 746496 = 212^2 + 864^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791443) by changing a digit.

791440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 660 + ... + 1420.

2⁷⁹¹⁴⁴⁰ 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 791440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992124).

791440 is an abundant number, since it is smaller than the sum of its proper divisors (1192808).

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

791440 is a wasteful number, since it uses less digits than its factorization.

791440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 791440 is about 889.6291362135. The cubic root of 791440 is about 92.4994886750.

The spelling of 791440 in words is "seven hundred ninety-one thousand, four hundred forty".