18195229 has 4 divisors (see below), whose sum is σ = 19594876. Its totient is φ = 16795584.

The previous prime is 18195227. The next prime is 18195269. The reversal of 18195229 is 92259181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92259181 = 7 ⋅13179883.

It can be written as a sum of positive squares in 2 ways, for example, as 12425625 + 5769604 = 3525^2 + 2402^2 .

It is not a de Polignac number, because 18195229 - 2¹ = 18195227 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 (18195227) 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, 699804 + ... + 699829.

It is an arithmetic number, because the mean of its divisors is an integer number (4898719).

Almost surely, 2^18195229 is an apocalyptic number.

It is an amenable number.

18195229 is a deficient number, since it is larger than the sum of its proper divisors (1399647).

18195229 is a wasteful number, since it uses less digits than its factorization.

18195229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399646.

The product of its digits is 12960, while the sum is 37.

The square root of 18195229 is about 4265.5865950652. The cubic root of 18195229 is about 263.0182246283.

The spelling of 18195229 in words is "eighteen million, one hundred ninety-five thousand, two hundred twenty-nine".