18824197 has 4 divisors (see below), whose sum is σ = 21513376. Its totient is φ = 16135020.

The previous prime is 18824171. The next prime is 18824203. The reversal of 18824197 is 79142881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79142881 = 179 ⋅442139.

It is a cyclic number.

It is not a de Polignac number, because 18824197 - 2¹⁵ = 18791429 is a prime.

It is a super-3 number, since 3×18824197³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18824107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344579 + ... + 1344592.

It is an arithmetic number, because the mean of its divisors is an integer number (5378344).

Almost surely, 2^18824197 is an apocalyptic number.

It is an amenable number.

18824197 is a deficient number, since it is larger than the sum of its proper divisors (2689179).

18824197 is an equidigital number, since it uses as much as digits as its factorization.

18824197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689178.

The product of its digits is 32256, while the sum is 40.

The square root of 18824197 is about 4338.6860914337. The cubic root of 18824197 is about 266.0146080884.

The spelling of 18824197 in words is "eighteen million, eight hundred twenty-four thousand, one hundred ninety-seven".