18424199 has 4 divisors (see below), whose sum is σ = 19018560. Its totient is φ = 17829840.

The previous prime is 18424181. The next prime is 18424201. The reversal of 18424199 is 99142481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99142481 = 367 ⋅270143.

It is a cyclic number.

It is not a de Polignac number, because 18424199 - 2¹⁶ = 18358663 is a prime.

It is a super-2 number, since 2×18424199² = 678902217583202, which contains 22 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 (18424139) 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, 297134 + ... + 297195.

It is an arithmetic number, because the mean of its divisors is an integer number (4754640).

Almost surely, 2^18424199 is an apocalyptic number.

18424199 is a deficient number, since it is larger than the sum of its proper divisors (594361).

18424199 is an equidigital number, since it uses as much as digits as its factorization.

18424199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594360.

The product of its digits is 20736, while the sum is 38.

The square root of 18424199 is about 4292.3419015731. The cubic root of 18424199 is about 264.1169085440.

The spelling of 18424199 in words is "eighteen million, four hundred twenty-four thousand, one hundred ninety-nine".