16503240 has 128 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 3978240.

The previous prime is 16503211. The next prime is 16503241. The reversal of 16503240 is 4230561.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16503241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110686 + ... + 110834.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^16503240 is an apocalyptic number.

16503240 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 16503240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216000).

16503240 is an abundant number, since it is smaller than the sum of its proper divisors (37928760).

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

16503240 is a wasteful number, since it uses less digits than its factorization.

16503240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 16503240 is about 4062.4179991724. The cubic root of 16503240 is about 254.5988309525.

The spelling of 16503240 in words is "sixteen million, five hundred three thousand, two hundred forty".