32440 has 16 divisors (see below), whose sum is σ = 73080. Its totient is φ = 12960.

The previous prime is 32429. The next prime is 32441. The reversal of 32440 is 4423.

It is a nialpdrome in base 14.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 32440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32441) 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, 366 + ... + 445.

2³²⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

32440 is an abundant number, since it is smaller than the sum of its proper divisors (40640).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36540).

32440 is a wasteful number, since it uses less digits than its factorization.

32440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 32440 is about 180.1110768387. Note that the first 3 decimals coincide. The cubic root of 32440 is about 31.8928709219.

Adding to 32440 its reverse (4423), we get a palindrome (36863).

The spelling of 32440 in words is "thirty-two thousand, four hundred forty".