535440 has 80 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 135168.

The previous prime is 535399. The next prime is 535481. The reversal of 535440 is 44535.

535440 = T₁₂₉ + T₁₃₀ + ... + T₁₇₄.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (535399) and next prime (535481).

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

It is an Ulam number.

It is an unprimeable number.

535440 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 15 ways as a sum of consecutive naturals, for example, 5472 + ... + 5568.

2⁵³⁵⁴⁴⁰ 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 535440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874944).

535440 is an abundant number, since it is smaller than the sum of its proper divisors (1214448).

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

535440 is a wasteful number, since it uses less digits than its factorization.

535440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 535440 is about 731.7376579075. The cubic root of 535440 is about 81.2026627614.

Adding to 535440 its reverse (44535), we get a palindrome (579975).

The spelling of 535440 in words is "five hundred thirty-five thousand, four hundred forty".