18924481 has 2 divisors, whose sum is σ = 18924482. Its totient is φ = 18924480.

The previous prime is 18924473. The next prime is 18924487. The reversal of 18924481 is 18442981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 9096256 = 3135^2 + 3016^2 .

It is a cyclic number.

It is not a de Polignac number, because 18924481 - 2³ = 18924473 is a prime.

It is a super-2 number, since 2×18924481² = 716271962238722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18924481.

It is not a weakly prime, because it can be changed into another prime (18924487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9462240 + 9462241.

It is an arithmetic number, because the mean of its divisors is an integer number (9462241).

Almost surely, 2^18924481 is an apocalyptic number.

It is an amenable number.

18924481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18924481 is an equidigital number, since it uses as much as digits as its factorization.

18924481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 18924481 is about 4350.2276951902. The cubic root of 18924481 is about 266.4861603083.

The spelling of 18924481 in words is "eighteen million, nine hundred twenty-four thousand, four hundred eighty-one".