18299421 has 48 divisors (see below), whose sum is σ = 32138496. Its totient is φ = 9808128.

The previous prime is 18299419. The next prime is 18299431. The reversal of 18299421 is 12499281.

It is not a de Polignac number, because 18299421 - 2¹ = 18299419 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18299401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105691 + ... + 105863.

It is an arithmetic number, because the mean of its divisors is an integer number (669552).

Almost surely, 2^18299421 is an apocalyptic number.

It is an amenable number.

18299421 is a deficient number, since it is larger than the sum of its proper divisors (13839075).

18299421 is a wasteful number, since it uses less digits than its factorization.

18299421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 279 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 18299421 is about 4277.7822525229. The cubic root of 18299421 is about 263.5193129760.

The spelling of 18299421 in words is "eighteen million, two hundred ninety-nine thousand, four hundred twenty-one".