18228777 has 16 divisors (see below), whose sum is σ = 29411712. Its totient is φ = 9803520.

The previous prime is 18228703. The next prime is 18228797. The reversal of 18228777 is 77782281.

It is not a de Polignac number, because 18228777 - 2⁷ = 18228649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18228797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25174 + ... + 25887.

It is an arithmetic number, because the mean of its divisors is an integer number (1838232).

Almost surely, 2^18228777 is an apocalyptic number.

18228777 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18228777 is a deficient number, since it is larger than the sum of its proper divisors (11182935).

18228777 is a wasteful number, since it uses less digits than its factorization.

18228777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51088.

The product of its digits is 87808, while the sum is 42.

The square root of 18228777 is about 4269.5171858186. The cubic root of 18228777 is about 263.1797746320.

The spelling of 18228777 in words is "eighteen million, two hundred twenty-eight thousand, seven hundred seventy-seven".