18428277 has 16 divisors (see below), whose sum is σ = 28680192. Its totient is φ = 10305840.

The previous prime is 18428273. The next prime is 18428297. The reversal of 18428277 is 77282481.

It is not a de Polignac number, because 18428277 - 2² = 18428273 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428273) 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, 8349 + ... + 10322.

It is an arithmetic number, because the mean of its divisors is an integer number (1792512).

Almost surely, 2^18428277 is an apocalyptic number.

It is an amenable number.

18428277 is a deficient number, since it is larger than the sum of its proper divisors (10251915).

18428277 is a wasteful number, since it uses less digits than its factorization.

18428277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18728.

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

The square root of 18428277 is about 4292.8169073465. The cubic root of 18428277 is about 264.1363935937.

The spelling of 18428277 in words is "eighteen million, four hundred twenty-eight thousand, two hundred seventy-seven".