16858240 has 128 divisors (see below), whose sum is σ = 47589120. Its totient is φ = 5591040.

The previous prime is 16858217. The next prime is 16858243. The reversal of 16858240 is 4285861.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 16858196 and 16858205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16858243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237405 + ... + 237475.

It is an arithmetic number, because the mean of its divisors is an integer number (371790).

Almost surely, 2^16858240 is an apocalyptic number.

16858240 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 16858240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23794560).

16858240 is an abundant number, since it is smaller than the sum of its proper divisors (30730880).

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

16858240 is an equidigital number, since it uses as much as digits as its factorization.

16858240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 16858240 is about 4105.8787122856. The cubic root of 16858240 is about 256.4114477346.

The spelling of 16858240 in words is "sixteen million, eight hundred fifty-eight thousand, two hundred forty".