18172449 has 24 divisors (see below), whose sum is σ = 27081600. Its totient is φ = 11737440.

The previous prime is 18172423. The next prime is 18172459. The reversal of 18172449 is 94427181.

It is not a de Polignac number, because 18172449 - 2¹³ = 18164257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18172459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43162 + ... + 43580.

It is an arithmetic number, because the mean of its divisors is an integer number (1128400).

Almost surely, 2^18172449 is an apocalyptic number.

It is an amenable number.

18172449 is a deficient number, since it is larger than the sum of its proper divisors (8909151).

18172449 is a wasteful number, since it uses less digits than its factorization.

18172449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 562 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 18172449 is about 4262.9155515914. The cubic root of 18172449 is about 262.9084145726.

The spelling of 18172449 in words is "eighteen million, one hundred seventy-two thousand, four hundred forty-nine".