16539540 has 48 divisors (see below), whose sum is σ = 47080320. Its totient is φ = 4337280.

The previous prime is 16539539. The next prime is 16539547. The reversal of 16539540 is 4593561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16539547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1401 + ... + 5919.

It is an arithmetic number, because the mean of its divisors is an integer number (980840).

Almost surely, 2^16539540 is an apocalyptic number.

16539540 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 16539540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23540160).

16539540 is an abundant number, since it is smaller than the sum of its proper divisors (30540780).

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

16539540 is a wasteful number, since it uses less digits than its factorization.

16539540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592 (or 4590 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 16539540 is about 4066.8833275618. The cubic root of 16539540 is about 254.7853634100.

The spelling of 16539540 in words is "sixteen million, five hundred thirty-nine thousand, five hundred forty".