18428247 has 12 divisors (see below), whose sum is σ = 26699400. Its totient is φ = 12248208.

The previous prime is 18428239. The next prime is 18428269. The reversal of 18428247 is 74282481.

It is not a de Polignac number, because 18428247 - 2³ = 18428239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208 + ... + 6074.

It is an arithmetic number, because the mean of its divisors is an integer number (2224950).

Almost surely, 2^18428247 is an apocalyptic number.

18428247 is a deficient number, since it is larger than the sum of its proper divisors (8271153).

18428247 is a wasteful number, since it uses less digits than its factorization.

18428247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6222 (or 6219 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 18428247 is about 4292.8134131360. The cubic root of 18428247 is about 264.1362502615.

It can be divided in two parts, 1 and 8428247, that added together give a palindrome (8428248).

The spelling of 18428247 in words is "eighteen million, four hundred twenty-eight thousand, two hundred forty-seven".