18157216 has 48 divisors (see below), whose sum is σ = 44573760. Its totient is φ = 7073280.

The previous prime is 18157211. The next prime is 18157253. The reversal of 18157216 is 61275181.

It is not an unprimeable number, because it can be changed into a prime (18157211) 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, 1221 + ... + 6148.

It is an arithmetic number, because the mean of its divisors is an integer number (928620).

Almost surely, 2^18157216 is an apocalyptic number.

18157216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18157216 is an abundant number, since it is smaller than the sum of its proper divisors (26416544).

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

18157216 is a wasteful number, since it uses less digits than its factorization.

18157216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397 (or 7389 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 18157216 is about 4261.1284890273. The cubic root of 18157216 is about 262.8349333112.

The spelling of 18157216 in words is "eighteen million, one hundred fifty-seven thousand, two hundred sixteen".