18525816 has 48 divisors (see below), whose sum is σ = 50824800. Its totient is φ = 6095232.

The previous prime is 18525803. The next prime is 18525821. The reversal of 18525816 is 61852581.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4060 + ... + 7316.

It is an arithmetic number, because the mean of its divisors is an integer number (1058850).

Almost surely, 2^18525816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18525816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25412400).

18525816 is an abundant number, since it is smaller than the sum of its proper divisors (32298984).

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

18525816 is a wasteful number, since it uses less digits than its factorization.

18525816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348 (or 3341 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 18525816 is about 4304.1626363324. The cubic root of 18525816 is about 264.6015895202.

The spelling of 18525816 in words is "eighteen million, five hundred twenty-five thousand, eight hundred sixteen".