16539840 has 84 divisors (see below), whose sum is σ = 56900064. Its totient is φ = 4409856.

The previous prime is 16539839. The next prime is 16539857. The reversal of 16539840 is 4893561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 16539795 and 16539804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9 + ... + 5751.

Almost surely, 2^16539840 is an apocalyptic number.

16539840 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 16539840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28450032).

16539840 is an abundant number, since it is smaller than the sum of its proper divisors (40360224).

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

16539840 is a wasteful number, since it uses less digits than its factorization.

16539840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766 (or 5753 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 16539840 is about 4066.9202106754. The cubic root of 16539840 is about 254.7869038629.

Adding to 16539840 its sum of digits (36), we get a triangular number (16539876 = T₅₇₅₁).

The spelling of 16539840 in words is "sixteen million, five hundred thirty-nine thousand, eight hundred forty".