18244997 has 8 divisors (see below), whose sum is σ = 19256160. Its totient is φ = 17238960.

The previous prime is 18244991. The next prime is 18244999. The reversal of 18244997 is 79944281.

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 18244997 - 2¹⁶ = 18179461 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 (18244991) 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, 7718 + ... + 9800.

It is an arithmetic number, because the mean of its divisors is an integer number (2407020).

Almost surely, 2^18244997 is an apocalyptic number.

It is an amenable number.

18244997 is a deficient number, since it is larger than the sum of its proper divisors (1011163).

18244997 is a wasteful number, since it uses less digits than its factorization.

18244997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563.

The product of its digits is 145152, while the sum is 44.

The square root of 18244997 is about 4271.4162756631. The cubic root of 18244997 is about 263.2578107769.

The spelling of 18244997 in words is "eighteen million, two hundred forty-four thousand, nine hundred ninety-seven".