18151228 has 12 divisors (see below), whose sum is σ = 32364360. Its totient is φ = 8904272.

The previous prime is 18151219. The next prime is 18151249. The reversal of 18151228 is 82215181.

It is a junction number, because it is equal to n+sod(n) for n = 18151196 and 18151205.

It is a congruent number.

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, 42598 + ... + 43021.

It is an arithmetic number, because the mean of its divisors is an integer number (2697030).

Almost surely, 2^18151228 is an apocalyptic number.

It is an amenable number.

18151228 is a deficient number, since it is larger than the sum of its proper divisors (14213132).

18151228 is a wasteful number, since it uses less digits than its factorization.

18151228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85676 (or 85674 counting only the distinct ones).

The product of its digits is 1280, while the sum is 28.

The square root of 18151228 is about 4260.4258003162. The cubic root of 18151228 is about 262.8060370196.

The spelling of 18151228 in words is "eighteen million, one hundred fifty-one thousand, two hundred twenty-eight".