18463921 has 12 divisors (see below), whose sum is σ = 22418368. Its totient is φ = 14893632.

The previous prime is 18463919. The next prime is 18463937. The reversal of 18463921 is 12936481.

It is not a de Polignac number, because 18463921 - 2¹ = 18463919 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18463121) 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 11 ways as a sum of consecutive naturals, for example, 2541 + ... + 6586.

Almost surely, 2^18463921 is an apocalyptic number.

It is an amenable number.

18463921 is a deficient number, since it is larger than the sum of its proper divisors (3954447).

18463921 is an equidigital number, since it uses as much as digits as its factorization.

18463921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168 (or 9151 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 18463921 is about 4296.9664881169. The cubic root of 18463921 is about 264.3065815796.

The spelling of 18463921 in words is "eighteen million, four hundred sixty-three thousand, nine hundred twenty-one".