18224997 has 8 divisors (see below), whose sum is σ = 27771456. Its totient is φ = 10414272.

The previous prime is 18224959. The next prime is 18225013. The reversal of 18224997 is 79942281.

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

It is not a de Polignac number, because 18224997 - 2⁸ = 18224741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18224957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433908 + ... + 433949.

It is an arithmetic number, because the mean of its divisors is an integer number (3471432).

Almost surely, 2^18224997 is an apocalyptic number.

It is an amenable number.

18224997 is a deficient number, since it is larger than the sum of its proper divisors (9546459).

18224997 is an equidigital number, since it uses as much as digits as its factorization.

18224997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867867.

The product of its digits is 72576, while the sum is 42.

The square root of 18224997 is about 4269.0744898631. The cubic root of 18224997 is about 263.1615819996.

It can be divided in two parts, 182 and 24997, that multiplied together give a palindrome (4549454).

The spelling of 18224997 in words is "eighteen million, two hundred twenty-four thousand, nine hundred ninety-seven".