18172245 has 32 divisors (see below), whose sum is σ = 35788032. Its totient is φ = 7667712.

The previous prime is 18172243. The next prime is 18172247. The reversal of 18172245 is 54227181.

It is an interprime number because it is at equal distance from previous prime (18172243) and next prime (18172247).

It is not a de Polignac number, because 18172245 - 2¹ = 18172243 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18172243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5292 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (1118376).

Almost surely, 2^18172245 is an apocalyptic number.

18172245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18172245 is a deficient number, since it is larger than the sum of its proper divisors (17615787).

18172245 is a wasteful number, since it uses less digits than its factorization.

18172245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13341.

The product of its digits is 4480, while the sum is 30.

The square root of 18172245 is about 4262.8916242382. The cubic root of 18172245 is about 262.9074307845.

The spelling of 18172245 in words is "eighteen million, one hundred seventy-two thousand, two hundred forty-five".