591440 has 20 divisors (see below), whose sum is σ = 1375284. Its totient is φ = 236544.

The previous prime is 591431. The next prime is 591443. The reversal of 591440 is 44195.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 440896 = 388^2 + 664^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 591440.

It is not an unprimeable number, because it can be changed into a prime (591443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3617 + ... + 3776.

2⁵⁹¹⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

591440 is an abundant number, since it is smaller than the sum of its proper divisors (783844).

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

591440 is a wasteful number, since it uses less digits than its factorization.

591440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7406 (or 7400 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 591440 is about 769.0513636943. The cubic root of 591440 is about 83.9402447278.

The spelling of 591440 in words is "five hundred ninety-one thousand, four hundred forty".