18642449 has 8 divisors (see below), whose sum is σ = 21417600. Its totient is φ = 15895296.

The previous prime is 18642431. The next prime is 18642467. The reversal of 18642449 is 94424681.

It is an interprime number because it is at equal distance from previous prime (18642431) and next prime (18642467).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18642449 - 2⁸ = 18642193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18642469) 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 7 ways as a sum of consecutive naturals, for example, 5549 + ... + 8250.

It is an arithmetic number, because the mean of its divisors is an integer number (2677200).

Almost surely, 2^18642449 is an apocalyptic number.

It is an amenable number.

18642449 is a deficient number, since it is larger than the sum of its proper divisors (2775151).

18642449 is a wasteful number, since it uses less digits than its factorization.

18642449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13999.

The product of its digits is 55296, while the sum is 38.

The square root of 18642449 is about 4317.6902390051. The cubic root of 18642449 is about 265.1557124498.

It can be divided in two parts, 18642 and 449, that added together give a palindrome (19091).

The spelling of 18642449 in words is "eighteen million, six hundred forty-two thousand, four hundred forty-nine".