16321440 has 96 divisors (see below), whose sum is σ = 52859520. Its totient is φ = 4230144.

The previous prime is 16321423. The next prime is 16321441. The reversal of 16321440 is 4412361.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (16321441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17301 + ... + 18219.

It is an arithmetic number, because the mean of its divisors is an integer number (550620).

Almost surely, 2^16321440 is an apocalyptic number.

16321440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16321440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26429760).

16321440 is an abundant number, since it is smaller than the sum of its proper divisors (36538080).

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

16321440 is a wasteful number, since it uses less digits than its factorization.

16321440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 16321440 is about 4039.9801979713. The cubic root of 16321440 is about 253.6604883792.

It can be divided in two parts, 16321 and 440, that added together give a palindrome (16761).

The spelling of 16321440 in words is "sixteen million, three hundred twenty-one thousand, four hundred forty".