18952213 has 4 divisors (see below), whose sum is σ = 21659680. Its totient is φ = 16244748.

The previous prime is 18952211. The next prime is 18952267. The reversal of 18952213 is 31225981.

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: 31225981 = 173 ⋅180497.

It is a cyclic number.

It is not a de Polignac number, because 18952213 - 2¹ = 18952211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18952211) 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, 1353723 + ... + 1353736.

It is an arithmetic number, because the mean of its divisors is an integer number (5414920).

Almost surely, 2^18952213 is an apocalyptic number.

It is an amenable number.

18952213 is a deficient number, since it is larger than the sum of its proper divisors (2707467).

18952213 is an equidigital number, since it uses as much as digits as its factorization.

18952213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707466.

The product of its digits is 4320, while the sum is 31.

The square root of 18952213 is about 4353.4139476967. The cubic root of 18952213 is about 266.6162666903.

The spelling of 18952213 in words is "eighteen million, nine hundred fifty-two thousand, two hundred thirteen".