18424231 has 12 divisors (see below), whose sum is σ = 21483952. Its totient is φ = 15477696.

The previous prime is 18424229. The next prime is 18424247. The reversal of 18424231 is 13242481.

It is not a de Polignac number, because 18424231 - 2¹ = 18424229 is a prime.

It is a super-2 number, since 2×18424231² = 678904575882722, which contains 22 as substring.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 18424196 and 18424205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18424201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19195 + ... + 20131.

Almost surely, 2^18424231 is an apocalyptic number.

18424231 is a deficient number, since it is larger than the sum of its proper divisors (3059721).

18424231 is an frugal number, since it uses more digits than its factorization.

18424231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 997 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 18424231 is about 4292.3456291403. The cubic root of 18424231 is about 264.1170614541.

The spelling of 18424231 in words is "eighteen million, four hundred twenty-four thousand, two hundred thirty-one".