16503940 has 24 divisors (see below), whose sum is σ = 36697752. Its totient is φ = 6213120.

The previous prime is 16503919. The next prime is 16503941. The reversal of 16503940 is 4930561.

It can be written as a sum of positive squares in 4 ways, for example, as 311364 + 16192576 = 558^2 + 4024^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16503899 and 16503908.

It is not an unprimeable number, because it can be changed into a prime (16503941) 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, 23931 + ... + 24610.

It is an arithmetic number, because the mean of its divisors is an integer number (1529073).

Almost surely, 2^16503940 is an apocalyptic number.

16503940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16503940 is an abundant number, since it is smaller than the sum of its proper divisors (20193812).

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

16503940 is a wasteful number, since it uses less digits than its factorization.

16503940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48567 (or 48565 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 16503940 is about 4062.5041538440. The cubic root of 16503940 is about 254.6024305823.

The spelling of 16503940 in words is "sixteen million, five hundred three thousand, nine hundred forty".