18156016 has 40 divisors (see below), whose sum is σ = 37140480. Its totient is φ = 8581056.

The previous prime is 18156013. The next prime is 18156023. The reversal of 18156016 is 61065181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37665 + ... + 38143.

It is an arithmetic number, because the mean of its divisors is an integer number (928512).

Almost surely, 2^18156016 is an apocalyptic number.

18156016 is a gapful number since it is divisible by the number (16) 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 18156016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18570240).

18156016 is an abundant number, since it is smaller than the sum of its proper divisors (18984464).

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

18156016 is a wasteful number, since it uses less digits than its factorization.

18156016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 18156016 is about 4260.9876789308. The cubic root of 18156016 is about 262.8291429803.

The spelling of 18156016 in words is "eighteen million, one hundred fifty-six thousand, sixteen".