18228771 has 36 divisors (see below), whose sum is σ = 30499560. Its totient is φ = 10454400.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228771 is 17782281.

It is a happy number.

It is not a de Polignac number, because 18228771 - 2¹⁴ = 18212387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18228701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20251 + ... + 21131.

It is an arithmetic number, because the mean of its divisors is an integer number (847210).

Almost surely, 2^18228771 is an apocalyptic number.

18228771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18228771 is a deficient number, since it is larger than the sum of its proper divisors (12270789).

18228771 is a wasteful number, since it uses less digits than its factorization.

18228771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 914 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 18228771 is about 4269.5164831629. The cubic root of 18228771 is about 263.1797457568.

The spelling of 18228771 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred seventy-one".