18814213 has 4 divisors (see below), whose sum is σ = 20524608. Its totient is φ = 17103820.

The previous prime is 18814193. The next prime is 18814247. The reversal of 18814213 is 31241881.

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: 31241881 = 11 ⋅2840171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18814213 is a prime.

It is a super-2 number, since 2×18814213² = 707949221618738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814273) 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 3 ways as a sum of consecutive naturals, for example, 855181 + ... + 855202.

It is an arithmetic number, because the mean of its divisors is an integer number (5131152).

Almost surely, 2^18814213 is an apocalyptic number.

It is an amenable number.

18814213 is a deficient number, since it is larger than the sum of its proper divisors (1710395).

18814213 is a wasteful number, since it uses less digits than its factorization.

18814213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710394.

The product of its digits is 1536, while the sum is 28.

The square root of 18814213 is about 4337.5353600864. The cubic root of 18814213 is about 265.9675700566.

The spelling of 18814213 in words is "eighteen million, eight hundred fourteen thousand, two hundred thirteen".