18825229 has 4 divisors (see below), whose sum is σ = 19180476. Its totient is φ = 18469984.

The previous prime is 18825227. The next prime is 18825241. The reversal of 18825229 is 92252881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92252881 = 7 ⋅13178983.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 6749604 = 3475^2 + 2598^2 .

It is a cyclic number.

It is not a de Polignac number, because 18825229 - 2¹ = 18825227 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 (18825221) 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, 177544 + ... + 177649.

It is an arithmetic number, because the mean of its divisors is an integer number (4795119).

Almost surely, 2^18825229 is an apocalyptic number.

It is an amenable number.

18825229 is a deficient number, since it is larger than the sum of its proper divisors (355247).

18825229 is an equidigital number, since it uses as much as digits as its factorization.

18825229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355246.

The product of its digits is 23040, while the sum is 37.

The square root of 18825229 is about 4338.8050198182. The cubic root of 18825229 is about 266.0194692441.

The spelling of 18825229 in words is "eighteen million, eight hundred twenty-five thousand, two hundred twenty-nine".