18836213 has 4 divisors (see below), whose sum is σ = 20548608. Its totient is φ = 17123820.

The previous prime is 18836183. The next prime is 18836249. The reversal of 18836213 is 31263881.

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.

It is a cyclic number.

It is not a de Polignac number, because 18836213 - 2¹² = 18832117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18836213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18836113) 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, 856181 + ... + 856202.

It is an arithmetic number, because the mean of its divisors is an integer number (5137152).

Almost surely, 2^18836213 is an apocalyptic number.

It is an amenable number.

18836213 is a deficient number, since it is larger than the sum of its proper divisors (1712395).

18836213 is a wasteful number, since it uses less digits than its factorization.

18836213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712394.

The product of its digits is 6912, while the sum is 32.

The square root of 18836213 is about 4340.0706215452. The cubic root of 18836213 is about 266.0711975169.

The spelling of 18836213 in words is "eighteen million, eight hundred thirty-six thousand, two hundred thirteen".