16503440 has 40 divisors (see below), whose sum is σ = 38955840. Its totient is φ = 6500736.

The previous prime is 16503437. The next prime is 16503449. The reversal of 16503440 is 4430561.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (16503449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3821 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (973896).

Almost surely, 2^16503440 is an apocalyptic number.

16503440 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 16503440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19477920).

16503440 is an abundant number, since it is smaller than the sum of its proper divisors (22452400).

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

16503440 is a wasteful number, since it uses less digits than its factorization.

16503440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3159 (or 3153 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 16503440 is about 4062.4426149793. The cubic root of 16503440 is about 254.5998594285.

The spelling of 16503440 in words is "sixteen million, five hundred three thousand, four hundred forty".