18225413 has 4 divisors (see below), whose sum is σ = 18234528. Its totient is φ = 18216300.

The previous prime is 18225409. The next prime is 18225437. The reversal of 18225413 is 31452281.

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.

It is a cyclic number.

It is not a de Polignac number, because 18225413 - 2² = 18225409 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 (18225013) 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, 113 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (4558632).

Almost surely, 2^18225413 is an apocalyptic number.

It is an amenable number.

18225413 is a deficient number, since it is larger than the sum of its proper divisors (9115).

18225413 is an equidigital number, since it uses as much as digits as its factorization.

18225413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9114.

The product of its digits is 1920, while the sum is 26.

The square root of 18225413 is about 4269.1232120893. The cubic root of 18225413 is about 263.1635842749.

Adding to 18225413 its reverse (31452281), we get a palindrome (49677694).

The spelling of 18225413 in words is "eighteen million, two hundred twenty-five thousand, four hundred thirteen".