18145856 has 28 divisors (see below), whose sum is σ = 36172140. Its totient is φ = 9031680.

The previous prime is 18145843. The next prime is 18145877. The reversal of 18145856 is 65854181.

It can be written as a sum of positive squares in 2 ways, for example, as 8904256 + 9241600 = 2984^2 + 3040^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17480 + ... + 18488.

Almost surely, 2^18145856 is an apocalyptic number.

18145856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18145856 is a deficient number, since it is larger than the sum of its proper divisors (18026284).

18145856 is a wasteful number, since it uses less digits than its factorization.

18145856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 1292 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 18145856 is about 4259.7953002462. The cubic root of 18145856 is about 262.7801079506.

The spelling of 18145856 in words is "eighteen million, one hundred forty-five thousand, eight hundred fifty-six".