18894229 has 4 divisors (see below), whose sum is σ = 18903040. Its totient is φ = 18885420.

The previous prime is 18894223. The next prime is 18894233. The reversal of 18894229 is 92249881.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92249881 = 73 ⋅1263697.

It is a cyclic number.

It is not a de Polignac number, because 18894229 - 2¹⁵ = 18861461 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 (18894223) 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, 1132 + ... + 6250.

It is an arithmetic number, because the mean of its divisors is an integer number (4725760).

Almost surely, 2^18894229 is an apocalyptic number.

It is an amenable number.

18894229 is a deficient number, since it is larger than the sum of its proper divisors (8811).

18894229 is an equidigital number, since it uses as much as digits as its factorization.

18894229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8810.

The product of its digits is 82944, while the sum is 43.

The square root of 18894229 is about 4346.7492451256. The cubic root of 18894229 is about 266.3440861544.

The spelling of 18894229 in words is "eighteen million, eight hundred ninety-four thousand, two hundred twenty-nine".