18225615 has 16 divisors (see below), whose sum is σ = 30876768. Its totient is φ = 9148416.

The previous prime is 18225611. The next prime is 18225653. The reversal of 18225615 is 51652281.

It is not a de Polignac number, because 18225615 - 2² = 18225611 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35482 + ... + 35991.

It is an arithmetic number, because the mean of its divisors is an integer number (1929798).

Almost surely, 2^18225615 is an apocalyptic number.

18225615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18225615 is a deficient number, since it is larger than the sum of its proper divisors (12651153).

18225615 is a wasteful number, since it uses less digits than its factorization.

18225615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71498.

The product of its digits is 4800, while the sum is 30.

The square root of 18225615 is about 4269.1468702775. The cubic root of 18225615 is about 263.1645565226.

Adding to 18225615 its reverse (51652281), we get a palindrome (69877896).

The spelling of 18225615 in words is "eighteen million, two hundred twenty-five thousand, six hundred fifteen".