18124213 has 4 divisors (see below), whose sum is σ = 18153568. Its totient is φ = 18094860.

The previous prime is 18124201. The next prime is 18124229. The reversal of 18124213 is 31242181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31242181 = 107 ⋅291983.

It is a cyclic number.

It is not a de Polignac number, because 18124213 - 2²¹ = 16027061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18124273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13731 + ... + 14992.

It is an arithmetic number, because the mean of its divisors is an integer number (4538392).

Almost surely, 2^18124213 is an apocalyptic number.

It is an amenable number.

18124213 is a deficient number, since it is larger than the sum of its proper divisors (29355).

18124213 is an equidigital number, since it uses as much as digits as its factorization.

18124213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29354.

The product of its digits is 384, while the sum is 22.

The square root of 18124213 is about 4257.2541620157. The cubic root of 18124213 is about 262.6755916628.

Adding to 18124213 its reverse (31242181), we get a palindrome (49366394).

The spelling of 18124213 in words is "eighteen million, one hundred twenty-four thousand, two hundred thirteen".