18228477 has 8 divisors (see below), whose sum is σ = 24897600. Its totient is φ = 11855840.

The previous prime is 18228461. The next prime is 18228487. The reversal of 18228477 is 77482281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18228477 - 2⁴ = 18228461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73977 + ... + 74222.

It is an arithmetic number, because the mean of its divisors is an integer number (3112200).

Almost surely, 2^18228477 is an apocalyptic number.

It is an amenable number.

18228477 is a deficient number, since it is larger than the sum of its proper divisors (6669123).

18228477 is a wasteful number, since it uses less digits than its factorization.

18228477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148243.

The product of its digits is 50176, while the sum is 39.

The square root of 18228477 is about 4269.4820528959. The cubic root of 18228477 is about 263.1783308642.

The spelling of 18228477 in words is "eighteen million, two hundred twenty-eight thousand, four hundred seventy-seven".